Peter Geer Posted July 1 Report Share Posted July 1 Hi all, I am new to this forum and looking for some help. I own a 1971 MK3 GT6 and have just stripped down the gearbox and overdrive as it had developed a bit of a rumble. I found the source of the noise (input shaft bearing) but thought I should recondition the gearbox and overdrive whilst I had them out of the car. The gearbox has been quite straightforward but the overdrive is a J type not the usual D type fitted to the GT6. As this is the first time I have ever rebuilt an overdrive of any kind can somebody point me to where I could find a good exploded diagram for the J type overdrive. Thanks in advance. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted July 1 Report Share Posted July 1 These any use? I just searched "j-type overdrive exploded diagram" on the Net and got loads, so plenty about - just see which one you prefer. Link to comment Share on other sites More sharing options...
Peter Geer Posted July 1 Author Report Share Posted July 1 Thanks, I found a few like this too but was trying to find something that identified the parts as well as I may need to order a few parts Link to comment Share on other sites More sharing options...
johny Posted July 1 Report Share Posted July 1 The triumph workshop manuals available for free download on vitessesteve.co.uk have J type OD diagrams with part names but not numbers. Either the Dolomite Sprint or maybe later TR6 ones will probably be most helpful... Link to comment Share on other sites More sharing options...
Peter Geer Posted July 1 Author Report Share Posted July 1 Perfect, thanks Link to comment Share on other sites More sharing options...
Colin Lindsay Posted July 2 Report Share Posted July 2 13 hours ago, Peter Geer said: Thanks, I found a few like this too but was trying to find something that identified the parts as well as I may need to order a few parts The top one I posted is Moss Motors, the numbers link to each part on their website. https://mossmotors.com/trs-028-j-type-overdrive Also for spare parts: https://www.overdrive-repairs.co.uk http://www.odspares.com/phdi/p1.nsf/supppages/odspares?opendocument&part=2 Link to comment Share on other sites More sharing options...
68vitesse Posted July 2 Report Share Posted July 2 Did strip a J type overdrive down once, yellow metal washer broke up, had it rebuilt by Overdrive Repairs Sheffield as the problem is getting there pressure to match the engine power. One way it slips the other a harsh engagement, in my Vitesse very smooth. Regards Paul. Link to comment Share on other sites More sharing options...
Stratton Jimmer Posted July 2 Report Share Posted July 2 I have a service manual albeit a Vauxhall one. If you need any specific bit of the instructions, let me know. Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 3 Report Share Posted July 3 (edited) in general J types are robust and trouble free the only snag i have found is the inner spool valve piston inside the guts of the solenoid 0 rings get stuck the maraca's test shake the sol. it should hear the inner piston rattle . easy to repair remove the small 10mm circlip in the solenoid knock out the inner piston/spool and clean refit with new 0 rings , re rattle the test and refit . needs a 1"af thin wall spanner to loosen the solenoid, do not use grips on its case you can wreck it apart from filter cleaning leave the rest of the unit alone Pete Edited July 3 by Pete Lewis Link to comment Share on other sites More sharing options...
johny Posted July 3 Report Share Posted July 3 Yes Ive just done a D type and wouldnt do a complete strip but have replaced all o rings and cleaned oil ways as cheap and easy to do. Presume J version similar👍 Link to comment Share on other sites More sharing options...
Peter Geer Posted July 7 Author Report Share Posted July 7 Thanks all Link to comment Share on other sites More sharing options...
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