ZF AS-Tronic GS3 Gearbox Shift Modulator / Actuator

Rated 5.00 out of 5 based on 48 customer ratings
(48 customer reviews)

From £650.00

All ZF AS-TRONIC MODULATORS (a.k.a. ZF AS-TRONIC ACTUATORS) are supplied on a purchase-exchange basis.

This simply means that we send you a fully remanufactured bottom half ZF AS-TRONIC MODULATOR and in return, you send the faulty core unit back to us (We prefer and recommend DHL as a courier service as they are fully trackable worldwide).

Your modulator will be delivered wrapped in our special unique protective packaging. In order to reduce our carbon footprint, we recommend that you reuse this packaging to return your faulty core unit back to us.

Once your order is placed, you will receive an email containing the address to send your faulty unit to.

If you have any questions on how this process works, please don’t hesitate to contact us.

More information on ZF AS-Tronic Modulator / Actuator.

Note: This product has an additional £400 surcharge on top of the standard price. This is only until we receive your faulty core unit, at which point this surcharge is immediately refunded.

Note 2: When filling in shipping paperwork, please mark faulty goods for repair with a minimal/no cost value as we are not responsible for paying import duty on received units.


Additional information

Bottom Gasket

None, Bottom Gasket

Lid Gasket

None, Lid Gasket

48 reviews for ZF AS-Tronic GS3 Gearbox Shift Modulator / Actuator

  1. Avatar
    Rated 5 out of 5

    Al Buxton

    We had an Iveco Stralis in our workshop for three weeks losing us money, we rang Shane and he was out to us the same day to collect the actuator and returned it fully working. (E.C.U Issue).
    Excellent work and saved us a fortune on main dealer costs, Would thoroughly recommend Airtronics for a fast turn around at an affordable price.
    Many Thanks
    Al from Derbyshire.

  2. Avatar
    Rated 5 out of 5

    Gavin robinson

    I had an issue with the actuator leaking air on our as tronic gearbox and after talking to Shane about the fault he assured me that his refurbished actuator would have us up and running in no time,
    True to his word he had the item delivered the next day and not only repaired the air leak but made the gear changes smoother
    Extremely friendly service, great product at a great price, would not hesitate to use again
    Thank you Shane

  3. Avatar
    Rated 5 out of 5


    I had lost a lot of money fitting a couple modulators from South Africa, I finally came across ATS. After fitting their unit the truck drives like it is coming from the factory, seamlessly shifting up and down with no hiccup. To anyone thinking twice about ATS, these guys are the really deal they come with real time support for people as far as Zimbabwe like me. Thumps to Shane and co.

  4. Avatar
    Rated 5 out of 5


    Good and clean business ethics by Shane and his promptness and accuracy in delivery made our transaction with him so pleasant. May his tribe increase !!

  5. Avatar
    Rated 5 out of 5

    John Shiels

    I had trouble with a Dennis R Series coach with ZF astronic gearbox, Shane had me sorted in no time. Very helpful, would highly recommend .
    John Shiels

  6. Avatar
    Rated 5 out of 5

    Dave Webster

    Great and efficient service just what you need in the modern transport world can do attitude wins every time delivered the unit for me too to speed up the process all good and fantastic service
    would recommend to anyone

  7. Avatar
    Rated 5 out of 5


    Received a GS3.3 complete unit, this morning very impressed how it arrived, very secure tightly wrapped, it was very clean. great and efficient service.

    I will differently be using Airtronics from now on to test all our Lids, Shane was very helpful and went that extra mile, to help us out.

    I would recommend him.

  8. Avatar
    Rated 5 out of 5


    Dean Abbco Transport Services -1st August 2018
    Collected astronic gearbox module for a daf cf ,very impressed to see the unit looking spanking new like Shane described .
    Fitted the unit when I got back works a treat ,Shane is a top bloke and knows his stuff and a pleasure to deal with Thank you
    Abbco transport will recommend Airtronics to anyone

  9. Avatar
    Rated 5 out of 5

    Benjamin York

    brilliant services from airtronics, and we will be using them again as we couldnt ask for more.

    big thank you from


  10. Avatar
    Rated 5 out of 5

    Jonathan kay

    This is the 2nd time we have used shane to get us back running again. Very reliable and very thorough with all parts of his service! Not many people left like this these days. Certainly went the extra mile to get the unit working again ASAP for us. Would highly recommend to use time and time again. Certainly knows his stuff on the boxes! Talked us through each stage which made it easier to understand and get fixed correctly!
    J & J T transport

  11. Avatar
    Rated 5 out of 5

    scott Hepworth

    We had a problem with a Auto ZF gearbox top we tried our local supplier to repair the part 3 times costing us down time and labour costs in our garage to keep removing and refitting the part which was never fixed. We found Shane on the web and he came out the same day to collect and returned the next day problem sorted at less than half the price from my normal local supplier Shane now gets all our work when required.
    Many thanks
    Custom Haulage Ltd

  12. Avatar
    Rated 5 out of 5

    Chris Wilkins

    Just echoing the reviews of Shane’s other customers. We had a coach with a faulty board which was blowing fuses on our Mercedes coach. We sent the complete modulator in to Shane at Airtronics and are very satisfied with the service we received. Clearly by talking to Shane on the phone you can tell that he is very experienced in his field and gives you confidence that the job is going to be done right. I feel that AirTronics went over and above what was expected to get our modulator up and running again. I hope we don’t have any further modulator problems but if we do, we would definitely be using AirTronics again. Would recommend Shane to anyone with an AS Tronic gearbox.

    Thanks again from Chris at Wilkins Coaches

  13. Avatar
    Rated 5 out of 5


    Old school values, friendly ,helpful and very knowledgeable
    great service fast turnaround i would recommend Shane to anybody having astronic problems
    Thanks again from Simon at BPH Ltd

  14. Avatar
    Rated 5 out of 5

    Paul. Clarke haulage

    Had a problem Friday with oil temp sensor in the modulator. Shane top man come out first thing Saturday morning and sorted it . Truck was back to work at ten o’clock. Excellent service can’t fault, will be using ATS again and would recommend fellow hauliers to try them out. Clarke Haulage Ltd.

  15. Avatar
    Rated 5 out of 5

    Steven lawson

    After having one of our Vanhool TX coaches not been able select any gear, we purchased a re manufactured GS3 modulator from Shane at ATS who kindly delivered it in person. New modulator fitted and now back on the road, the coach drives like a different vehicle, very smooth changes through the box I can’t believe the difference.
    Shane is very helpful and we will definitely use him again for any future failures within our fleet.

    Steven Lawson
    MM Band Services

  16. Avatar
    Rated 5 out of 5

    Jason Mottram

    We had a unit off the road for 3 weeks with what started as a faulty Modulator, then we had a Speed sensor issue with the replacement.
    Shane diagnosed the problem almost immediately, unit was back on the road next day.
    It’s nice to find someone that really knows his stuff, highly recommended and we will defiantly use him again.

    Jason Mottram

  17. Avatar
    Rated 5 out of 5

    Vladimir Hristov

    I operate a haulage company in Bulgaria and have trucks in the U.K. making deliveries all the time. My driver reported that he had lost automatic and could only drive in manual, I found ATS on the internet and contacted Shane who arranged the delivery of a replacement Modulator to a garage in London where my driver would arrive the same day to have the unit fitted.
    The transfer of the payment for the unit was very easy and included the surcharge to be refunded when the faulty unit was sent back. Shane spoke with the mechanics and instructed them on how to fit the Modulator as they were not familiar with fitting this part, the next day Shane arranged the collection of the faulty Modulator and I was refunded my surcharge. The whole process of the purchase, delivery, fitting and return was excellent and I cannot thank Shane enough for his very professional customer service. I would recommend ATS and Shane to all my fellow countrymen and to any other European drivers who have a Modulator fault.
    Many Many thanks Shane.
    Vladimir Georesurs PH Ltd Bulgaria

  18. Avatar
    Rated 5 out of 5


    We are a small passenger transportation (tourist bus rental) company from Lithuania. We have repeatedly encountered problems with the ZF Astronic gearbox shift modulators, that we needed a solution for. Passenger transportation is a very responsible business, and the bus repairs are not easy either, so we needed a reliable and inexpensive solution. And there I found Airtronics Transmission Services with Mr. Shane Collinge (thanks to Google). Nice and businesslike communication, even off workhours (which was surprising for me) has left me with a very good impression. I have never met this person but now I can tell for sure that you can trust him. Thank you, Shane, for a well done job.

    Owner of UAB Arselina,
    Artūras Rozenbergas.

  19. Avatar
    Rated 5 out of 5

    Jamie Cavill

    After being given Shane’s number by a mate one call got the ball rolling with the modulator removed Shane collected it the same day worked on it the following day ,and it was returned the next morning with fitting tips and torque settings . Now it’s fitted it’s like a new truck . One word comes to mind SERVICE thanks Shane for a job well done .

  20. Avatar
    Rated 5 out of 5

    Tony Matthews

    Good service. Shane is very polite and helpful. Turn around is fast replacement unit worked perfect

  21. Avatar
    Rated 5 out of 5

    Aare from Estonia

    Very friendly, helpful and trustworthy.
    If anyone has any doubts…may contact me
    I highly recommend it.
    This customer service is world class gold

  22. Avatar
    Rated 5 out of 5

    Aare from Estonia

    Was experiencing good and polite service, honest hasn’t gotten such good service yet, just super !!!!
    Thank you very much Mr Collinge and I would certainly recommend to others.
    From Aare Estonia.
    Thanks again from Aare Estonia.

  23. Avatar
    Rated 5 out of 5

    Mark Curley

    Struggled with vehicle stuck in Neutral gear. After consulting with different companies and paying for engineers to test the vehicle, we were still none the wiser. At last we were passed the info of ATS and gave them a ring. Shane spoke to me in person and quickly identified the possible causes over the phone. We had the unit with Shane the same day as the diagnosis and it was ready for collection within 24 hours !
    During the fitting process Shane had made it clear that I could ring him with any further questions I had during installing the unit. Shane obviously has extensive knowledge and experience with these gearbox units. He was easy to talk to and clearly laid out the costs and the process of testing the unit.
    The Vehicle now drives perfectly
    Thank you very much Shane 5 stars

  24. Avatar
    Rated 5 out of 5

    Peter Titterington

    We had an air pressure fault with loss of gears on DAF XF euro 6. Shane gave us very good advise and excellent service. The truck was back on the road quickly and at a fraction of the dealer cost.
    I highly recommend.
    Peter Titterington
    Titteringtons Truck and Trailer Services LTD

  25. Avatar
    Rated 5 out of 5

    Mark Mwanza

    I had a problem with my Iveco Euro 5, it had an air low issue and couldn’t engage into neutral. The gearbox was leaking air from the side and I contacted Shane the man. Who was quick in response and after I explained my situation he told me I needed to replace my pneumatic component. After some back and forth I paid for the component 5 days later it was here in Zambia via DHL. Fitted it and the rest is history. Thanks Shane

  26. Avatar
    Rated 5 out of 5

    Oliver Dixon

    Having had a few challenges trying resolve failed gearbox gear selection on a Iveco Stralis I was introduced to Shane from Airtronics. His level of service in both quick response, quality of exchange compents was like a breath of fresh air . Prpoer old school mentality of engineering and customer service.

    Many thanks for all your help and advise.

    Oliver Dixon
    Managing Director

    Olduns Ltd

  27. Avatar
    Rated 5 out of 5

    Scott Stewart

    Over the past year we’ve had issues with two of our vehicles on the fleet, both being transmission related.
    We’re a large Isle of Man based transport firm with a massive fleet consisting of a depot in Skelmersdale.
    We got in touch with Shane regarding our issues, explaining all the testing we had carried out and a follow up plan to resolve the problems as down time to us is critical being where we are based..
    Between us a plan was drawn up..the modulators were removed and sent to Shane who turned them round pretty much instantaneously and got them back to the Island..through old school explanation and what I mean by that he run through the installation with precision, meticulousness but in such a way that it was so easy to understand, I mean were all engineers but Shane treated you like a person and no question was ever silly to him as he answered with no hesitation and complete confidence which is why a full recommendation is given by us to anyone who requires such a professional service by a professional team with the best aftermarket support..
    In the world we are in know doubt its all about making money and getting stuff out as quickly as possible and not caring about aftermarket, well I can safely and wholehearted say we at manx Independent Carriers Isle of Man do not entertain this work ethic as we strive to do the best for our customers and staff and the industry, and this is why Shane at Airtronics fits into our work ethic and is a true ambassador to Airtronic Transmission Services..
    I don’t want to bleat on, but the primary and aftermarket support we’ve had and are still receiving goes far and beyond expectation..
    Keep up the good work and thankyou for all your support and valuable advice.
    Scott Stewart
    Hgv technician
    Manx Independent Carriers (Isle of Man)

  28. Avatar
    Rated 5 out of 5

    Kieran Finn

    We had an issue with a zf automatic gearbox in a daf xf.
    Shane was so helpful and so obliging and any problem we had Shane would talk us through. I couldn’t recommend Airtonics Transmission Services enough definitely will be back again!

  29. Avatar
    Rated 5 out of 5

    Paul braham

    I had a fantastic quick service from Shane, had a Daf 106 with Modulator issues, I phoned Shane up and he came across to Barnsley to pick it up at dinner time, by 5pm the Modulator was back at Barnsley ready to be refitted. Thank you Shane for your response. Paul. @ chas braham

  30. Avatar
    Rated 5 out of 5

    John Lakeland

    Had an issue with as tronic gearbox stuck in gear. Coach wouldn’t start. Heard lots of horror stories about the cost of repairs by the usual suspects. Just by chance I saw a YouTube video of Chris Allen professional struggler who had a guy doing a tutorial of the AS tronic box. That guy was Shane. If you watch the video it will give you an insight of what to expect. We contacted Shane who picked our gearbox lid up the same day tested it that evening and returned it the following afternoon. The lid looked brand new . The whole unit looked like it was straight from the factory. Shane spent 2 hrs explaining how to put it back on the coach . Nothing was too much trouble. A true professional. Use this company ! You will not be disappointed.

  31. Avatar
    Rated 5 out of 5

    Kabo Sekwababe

    Am a happy man…Shane is the best_bought a programmed complete modulator which took only 3days to arrive in Botswana.That are installed to get my truck back on the road. Thanks Shane🙏

    Thanks from
    Kabo Sekwababe
    Gaborone Botswana

  32. Avatar
    Rated 5 out of 5

    Niall McLaughlin Coaches Ltd

    Had problems with AS top plate, posted to Shane and had it returned within 3 days and looks like brand new. Fitted it and it’s working perfectly. Strongly recommend Shane and will be giving him a call in the future if we have any other issues.

  33. Avatar
    Rated 5 out of 5

    andy beevers

    Advised by main dealer to contact Shane due to modulator issues.
    Unit collected Saturday pm returned and fitted Monday am.
    Fantastic service and great depth of knowledge.
    Would recommend to anybody. Brilliant

  34. Avatar
    Rated 5 out of 5

    Alex Whietehead

    I can easily say that Shane and ATS’s services were second to none, from communication to pricing and quality, to follow up service.
    We had a faulty modulator causing our CF85-460 to shut down repeatedly which Shane rebuilt to perfection and had shipped back to us here in Barbados within approximately 4 days. On top of this, Shane checked in with us on a consistent basis until we had refitted the unit and he knew we were back up and running.
    I highly recommend Shane and ATS to anyone.

    Thanks again
    Alex Whitehead
    Barbados (West Indies)

  35. Avatar
    Rated 5 out of 5


    Hi All,

    My Iveco Stralis 460 was going into neutral by itself with ETC warning 9B, A3 and AL on the dash. We thought its the clutch actuator but that did not fix the problem.

    Finally my regular mechanic diagnosed that it’s the faulty ZF Airtonic modulator that is creating the problem.

    I had a quote from few suppliers here in Australia but I wasn’t very impressed with the price as it was going to cost me a fortune to buy a new unit in here in Australia.

    I decided to go online and search for the modulator and that’s when my good time started.

    I found Airtronic Transmission Services and watched a video on their website which was extremely knowledgeable. It was nearly 54 minutes that explains everything about the modulator units and how to remove it and install it.

    After watching the video I was very impressed and decided to call Airtronic Transmission Services straight away.

    Shane answered the phone call and we were engaged in the conversation for more than 45 minutes. Shane was extremely polite, helpful and sounded very knowledgeable, genuine and trustworthy.

    Shane explained everything about the modulator and advised to check with the mechanic to whether it’s GS3.3 or GS3.6 to save us time and not receiving the wrong modulator.

    Furthermore, Shane spoke to my mechanic as well and he was also highly impressed with Shane’s customer service and wealth of knowledge regarding the ZF tronic modulators.

    I requested Shane to send the bottom half of the modulator here in Perth. Shane was very open and honest about the prices, custom duty that I might get charged and also the delivery charges through DHL.

    Shane placed the order in the system and started the process almost immediately. Shane also made and send the video of the modulator unit and the packaging in which it was getting delivered.

    The GS3.3 bottom half was sent on Thursday from UK and was arrived in DHL warehouse facility on Saturday after cleaing the customs.

    I picked up the unit from DHL on Monday morning and very impressed how it arrived. It was very clean, looked brand new and very secure and tightly wrapped exactly as shown in the video sent by Shane.

    The whole process of the purchase and delivery was very smooth, hassle free and excellent.

    My truck is now back on the road and is changing the gears very smoothly with no warnings on the dash.

    Once again Shane, Thank you very much for all your help. You are an amazing person and it was a great pleasure to deal with you.

    I highly recommend Airtronic Transmission Services to everyone.

    Kind Regards,
    Jagjeet Dua
    Perth Australia

  36. Avatar
    Rated 5 out of 5

    John Lakeland . Lakeland coaches

    Yet again we have had the absolute pleasure of dealing with Shane at Airtronics.
    Coach would not go above 5th gear then into neutral and spanner on dash. Took the lid off Shane picked it up an hour later came back with it the same day. Back on the road the following morning. amazing service which you just don’t get anymore. He brought his uncle with him for the ride what a character. Thanks again

  37. Avatar
    Rated 5 out of 5

    Melvin Klippenstein from Ontario Canada

    Received a GS3.3 complete unit, very impressed how it arrived, very secure tightly wrapped, it was very clean. great and efficient service.

    I will be using Shane from Airtronics from now on, Shane was very helpful and went that extra mile, to help us out.
    Shane was sooo helpful. We have a 2008 Setra S417 56 passenger coach bus. We used a few repair shops here in Canada. spent money but could never get our issue fixed. Shane knew his stuff inside and out. Talking to him on the phone he knew what I was supposed to see and what to expect. He shipped the part via DHL.
    Honest and a fair man. I was a bit worried at first just because of the distance and all but very quickly caught on he was the man and the place to go. Sent us a video what to expect and how to do it. He followed up with us making sure we were happy.

    We had so many issues with our tranny and no one here in Ontario Canada could figure out what was wrong and what to do. Shane, over on the other side of the world helped and fixed our rig. Works perfect.

    I would recommend him. There should be a 10 star LOL

  38. Avatar
    Rated 5 out of 5

    Freddie Barclay – Fox Feeds Ltd

    A real pleasure to deal with. Shane was helpful from the second he picked up the phone.

    Shane has helped us get a truck back on the road that would otherwise be parked up – many thanks!

  39. Avatar
    Rated 5 out of 5

    Alex – KB Coaches Ltd.

    Massive Thankyou and recommendations to Shane. We had been having trouble with our AS Tronic Gearbox for a while and upon being let down by someone else. We were able to get a very quick weekend turn around from ATS we sent our lid off on the Friday and had the new one back by the following Tuesday.

    Highly Recommend

    5 Stars

  40. Avatar
    Rated 5 out of 5

    Dave Merry

    Five stars just isn’t a high enough rating for the service Shane provides. Happy to talk you through every aspect of the problem and share all his extensive knowledge to assist in any way he can. A truck which has been giving us issues for quite some time is now back on the road thanks to ATS.

    If you are having AS Tronic headaches just give Shane a call.

  41. Avatar
    Rated 5 out of 5

    Ugo Emeanuwa

    Had a GMK 3050-1 crane down with a defective modulator which was not immediately diagnosed right.
    After it became obvious the modulator was the likely issue Shane came to the rescue and It only took less than 1 week
    and our machine was up and running again.
    5 Star personality and service I must say. Man knows his stuff and saved us a huge bill.
    Would recommend to anyone any day.
    Port Harcourt

  42. Avatar
    Rated 5 out of 5

    Nicolae Iancu

    I’ll start my review saying that 5 stars are not enought for Shane. He deserve more then that.
    So, I’ll make a long story short. I left Valencia with my Daf xf106 of 2015 having no problem and I barely arrived in Manchester Sunday morning, having hundreds of dashboard alarms with “Transmission malfunction” and real problem with my AS Tronic gearbox function. Payed a visit to Daf service in Manchester. After a diagnosis process, they told me the gearbox modulator must be replaced. Unfortunatelly, I couldn’t afford to replace it at Daf service, because of the huge price they asked for and please trust me, it was huge. I start looking for other solutions. Then I found Shane, who provided me the best services possible. After some clarifications about what’s happening with my truck, because Im not a specialist, he came where my truck was parked and replaced the gearbox modulator. Since then my truck has been working perfectly. He is a real profesional. I totally recomand you to work with him. Muchas gracias Shane

  43. Avatar
    Rated 5 out of 5


    Absolute pleasure to deal with, full of knowledge and helpful all the way, dropped it off and tested with a replacement on the shelf. Well worth the journey to deal with a decent company. Thanks Shane

  44. Avatar
    Rated 5 out of 5


    Absolute legend of a person to deal with very knowledgeable very helpful, keeps you up to date all through the process with pictures and videos, calls and texts the returned product actually looked like a brand new unit I will certainly be spreading your company to others 5 stars is not enough with the service from start to finish again thank you for everything Shane I shall return next time I need to.

  45. Avatar
    Rated 5 out of 5

    Kevin Legg

    Superb service from Shane, who, bent over backwards to fix a modulator for our Coach so we could get the vehicle back on the road. Very impressed with his initial response and the follow up calls checking to make sure everything was as it should be. Cannot fault the service from first contact through to delivery and after sales. would have no hesitation in recommending.

  46. Avatar
    Rated 5 out of 5

    Craig Reid

    Absolute pleasure of dealing with Shane at Airtronics.
    We had a truck off the road and Shane went above and beyond to get us out of a tricky situation.
    Could not recommend this company highly enough.

  47. Avatar
    Rated 5 out of 5

    Howard Banks

    Absolutely excellent service from Shane who diagnosed the problem with a ZF Astronic Modulator. I took the faulty unit to Shane and he quickly diagnosed the problem. Not only did he diagnose the problem, he took time to explain exactly what the problem was. I’m so impressed with Shane’s knowledge and professionalism that I wouldn’t dream of looking elsewhere to get one of these modulators checked out. At a fraction of the cost from a main agent Shane replaced the modulator with a remanufactured unit which looks as though it has come straight from the factory, which he also adds an excellent eighteen months warranty. I would recommend anyone to use Shane if they are experiencing any problems with gearbox modulators. He is without a doubt your man to contact. Many thanks Shane.

  48. Avatar
    Rated 5 out of 5

    David Gill

    We first used Airtronics Transmission Services with a gearbox fault, Found the company online and contacted Shane, From start to finish his expertise in diagnosing and advice were absolutely faultless. Very knowledgeable and helpful. We have used the services on 2 separate occasions and got our trucks back on the road. We delivered the modulator to his home address and the unit was tested while we waited, which is a massive time saver for ourselves. The cost involved is a huge saving compared to the main dealer prices and on top of that comes with 18 month Warranty too. Also I was able to contact Shane on weekends out of hours. I would highly recommend this company and especially Shane and his attention to detail, knowledge and customer service. We will not use anyone else.

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