bluetriumphsteve Posted December 3, 2019 Report Share Posted December 3, 2019 I've got a Spitfire Mk3 currently non overdrive with a 3 sync gearbox. I recently brought a Spitfire MkIV 4 sync D type overdrive for the car, and I am aware I need to get a new prop shaft I like historical accuracy and the novelty of non sync in first gear, so I want to stick with the 3 syn gearbox and marry the overdrive to this gearbox. So my question is, can I use the mainshaft of the 4 sync overdrive gear in the 3 sync gearbox? Or will I need to buy a new mainshaft for the 3 sync gearbox? Link to comment Share on other sites More sharing options...
johny Posted December 3, 2019 Report Share Posted December 3, 2019 no the two mainshafts are different parts so youd have to get a new 3 sync one (pt no 208142 listed at 218quid in Rimmers) and then youd be taking a risk on the spec of a repro part.... Link to comment Share on other sites More sharing options...
bluetriumphsteve Posted December 3, 2019 Author Report Share Posted December 3, 2019 Ok cheers mate Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 3, 2019 Report Share Posted December 3, 2019 or canley https://www.canleyclassics.com/triumph-spitfire-mkiii-gearbox-mainshaft Pete Link to comment Share on other sites More sharing options...
thescrapman Posted December 4, 2019 Report Share Posted December 4, 2019 Forget the novelty and just st bung the box it, that way you find out now what else is worn out in it now rather than after you have shelled out on a replacement mainshaft Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 4, 2019 Report Share Posted December 4, 2019 the first take off with a helical 1st gear will soon dissipate the ideas of nostalgic whines of a 3 sync. have to agree use what you have , see how its goes , it only takes an hour to whip it on and back off if not impressed gearbox repairs dont stop at the mainshaft also do you have the extended remote shaft with the inhibitor switch cam fitted ??? a rear mounting chassis plate and its mounting and D type must have a relay to feed the solenoid Pete Link to comment Share on other sites More sharing options...
bluetriumphsteve Posted December 4, 2019 Author Report Share Posted December 4, 2019 It's not just the novelty for the 3 sync, the 4 sync gearbox I have has a worn out input shaft, and the constant gear to the lay shaft on both the input and lay shaft is razor sharp due to the failed bearings. The D Type O/D sandwich plate, and mainshaft is good so it's possible to marry what I have to another non O/D gearbox My 3 sync non O/D currently in the Spit does wine, but it was because I've been offered a good condition non O/D 3 sync that I was thinking of marry them together. Unless anyone out there wants to offer me a 4 sync 3 rail non O/D for a reasonable price that I could marry to my D Type O/D to? And yeah Pete if you if you could PM me with more details with the conversion that would be awesome Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 4, 2019 Report Share Posted December 4, 2019 you can pick out most of whats needed from any online parts list eg https://www.canleyclassics.com/triumph-spitfire-mkiv/1500-d-type-overdrive-kit you can only marry a OD with a Non OD gearbox by replacing the mainshaft be it 3 or 4 sync Pete Link to comment Share on other sites More sharing options...
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