ronhatch Posted February 6 Report Share Posted February 6 Hi all, I am thinking of fitting a triumph 2000 O/D gearbox to my TR4, has anybody got a photo/drawing of the bracket needed to adapt the rear mounting? Regards Ron Quote Link to post Share on other sites
Lebro Posted February 6 Report Share Posted February 6 They are available from TR shop etc. Bob Quote Link to post Share on other sites
ronhatch Posted February 6 Author Report Share Posted February 6 thanks for the reply Bob but I heard they are quite expensive . Regards Ron Quote Link to post Share on other sites
Lebro Posted February 6 Report Share Posted February 6 (edited) Other things to consider, the rear flange on the box has the wrong hole spacing to fit the TR propshaft. The speedo drive is a 3.5:1 reduction whereas the TR setup is 2.5:1, so speedo will read slow. Finally the clutch is different, but simple fix is use the 2000 friction plate in the TR cover plate. The overdrive is not as strong as the TR one, & so is only used on 3rd, ,& 4th gear. Bob Edited February 6 by Lebro Quote Link to post Share on other sites
ronhatch Posted February 6 Author Report Share Posted February 6 thanks Bob for the info regards Ron Quote Link to post Share on other sites
Lebro Posted February 7 Report Share Posted February 7 Just though of something else. If you existing clutch cover is the coil spring type, then either the release mechanism in the gearbox will have to be changed to match, or, you will have to fit a diaphram clutch cover to suit the gearbox. This latter option will mean re drilling the flywheel as the holes are not in the same place. An alternative to using an adaptor mount for the overdrive would be to have it re-built with the correct rear casing. These are used on TR's & Healey 3000's My local gearbox specialists (Hardy Engineering) rebuilt mine (I have a 2000 box in my TR3) with the 3000 rear casing, & also added parts to bring it up to TR spec. They did not change the speedo drive (I guess they could have done) so I had to modify my speedo to read correctly (another story !) Bob Quote Link to post Share on other sites
ronhatch Posted February 7 Author Report Share Posted February 7 Hi, Bob ,thanks for the reply, I intended changing the original gearbox as it rattles in second and third and I have the 2000 O/D box. But looking at all the modifications I wonder if its worthwhile repairing the original, it rattles but doesn't crunch so I was hoping it could be the detente balls and springs. any thoughts would be appreciated. Regards Ron Quote Link to post Share on other sites
Lebro Posted February 7 Report Share Posted February 7 If your original box is an overdrive one swap the TR overdrive onto the 200 box, & swap the clutch release mechanism, & use T2000 friction plate in original clutch. Bob Quote Link to post Share on other sites
ronhatch Posted February 7 Author Report Share Posted February 7 Th e original box has no O/D Quote Link to post Share on other sites
BlueTR3A-5EKT Posted February 7 Report Share Posted February 7 On 2/6/2024 at 9:38 AM, ronhatch said: Hi all, I am thinking of fitting a triumph 2000 O/D gearbox to my TR4, has anybody got a photo/drawing of the bracket needed to adapt the rear mounting? Regards Ron What Moss offer. https://www.moss-europe.co.uk/overdrive-conversion-brackets.html Do you know if the 2000 gearbox has A or J type overdrive? Is that gearbox ok? Quote Link to post Share on other sites
ronhatch Posted February 8 Author Report Share Posted February 8 Cheers Peter , it is a J type and I have bench tested and it is OK Regards Ron Quote Link to post Share on other sites
BlueTR3A-5EKT Posted February 8 Report Share Posted February 8 You could ring Pete Cox Sportscars. They will know exactly what you will need. https://petecoxsportscars.co.uk/ Quote Link to post Share on other sites
ronhatch Posted February 8 Author Report Share Posted February 8 Hi Peter , I took your advice and phoned Peter Cox, he was very helpful and gave me a few things to check and to try that might eliminate or at least subdue the rattle. Regards Ron Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.