simpkinss Posted October 13, 2018 Report Share Posted October 13, 2018 I have a 1972 GT6 Mk3. It's a bits-and-pieces car, so the 3-rail gearbox has a J-type overdrive. But the number on the box is WE13325, which doesn't seem to accord with any lists I have found. Can anyone suggest what gearbox I've got, please? Link to comment Share on other sites More sharing options...
Nick Jones Posted October 13, 2018 Report Share Posted October 13, 2018 Most likely an early Dolomite 1850 'box. Direct swap once the bell housing has been changed for a GT6 one. The stamped letters may not mean a lot as most boxes have been rebuilt a number of times by now and parts get mixed. Nick 1 Link to comment Share on other sites More sharing options...
Pete Lewis Posted October 13, 2018 Report Share Posted October 13, 2018 http://www.wolfitt.com/numbers_and_ratios.htm the only W suffix used by triumph was 1500 FWD engines, ..doesnt help much as nick suggests it could be from anywhere theres no record of recon gearbox numbers afaik Pete 1 Link to comment Share on other sites More sharing options...
NonMember Posted October 13, 2018 Report Share Posted October 13, 2018 4 minutes ago, Pete Lewis said: http://www.wolfitt.com/numbers_and_ratios.htm the only W suffix used by triumph was 1500 FWD engines, ..doesnt help much That table does give WH/WM for 1850 Dolomite gearboxes, though not WE. I'd assume the WM is a single rail. However, the 1850 WSM lists WE for three-rail and WH for single-rail. To add a bit of confusion, WE on the axle number means auto, while on the commission number it means French market! 1 Link to comment Share on other sites More sharing options...
Colin Lindsay Posted October 13, 2018 Report Share Posted October 13, 2018 Mine is an 18/50 J-type box, and I'm sure it's a W prefix, but of course can't locate the photos to confirm which. 1 Link to comment Share on other sites More sharing options...
simpkinss Posted October 13, 2018 Author Report Share Posted October 13, 2018 Thank you all for your prompt replies. I am thinking of fitting an exchange box over the winter, so it seems that I need to search for a 1850 box, rather than a GT6 box. Link to comment Share on other sites More sharing options...
thescrapman Posted October 13, 2018 Report Share Posted October 13, 2018 What you have is the "ultimate" gearbox for a GT6 as it has the bigger mainshaft and possibly the better angles on the gears. get yours repaired is a better bet. Link to comment Share on other sites More sharing options...
Nick Jones Posted October 13, 2018 Report Share Posted October 13, 2018 1 hour ago, thescrapman said: it has the bigger mainshaft and possibly the better angles on the gears. Sadly not. All 3-rail mainshaft tips are the small ones. You have to go to the single rail for the bigger tip, which is inconveniently 1" longer - or get the improved aftermarket mainshaft with the big tip and open out the bearing bore in the input shaft. Possibly correct about the gear helix angles, don't know when that changed. It's still considered the best of the 3 rail close-ratio boxes, though the only real difference is the J-type OD. Nick Link to comment Share on other sites More sharing options...
simpkinss Posted November 7, 2018 Author Report Share Posted November 7, 2018 Just to close the circle on this thread, I decided to change the gearbox now as it had suddenly become very noisy, and so I approached TD Fitchett about a service exchange box. They didn't have this particular item in stock, but said they could rebuild mine in 2/3 days. The box was removed last Thursday and sent via Parcelforce that day, and was received by Fitchett's on Friday morning. I got a telephone call from Tony Fitchett at 2.30 to say he had completed the rebuild and he would return the item the following day - WOW! We received the rebuilt box yesterday afternoon. TD Fitchett may not have the fancy websites of some other suppliers, but their service can only be described as exemplary. I have no connection with TD Fitchett except as a very satisfied customer. Sam 1 Link to comment Share on other sites More sharing options...
johny Posted November 7, 2018 Report Share Posted November 7, 2018 Good service indeed! Let us know how it drives when its all bolted back in? Link to comment Share on other sites More sharing options...
simpkinss Posted November 17, 2018 Author Report Share Posted November 17, 2018 On 07/11/2018 at 17:38, johny said: Good service indeed! Let us know how it drives when its all bolted back in? ...........and everything is fine. Just got to struggle on refitting the dreaded tunnel and H-frame now! Sam Link to comment Share on other sites More sharing options...
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