Steves_TR6 Posted February 23, 2023 Report Share Posted February 23, 2023 (edited) Good afternoon ladies and gentlemen, long time no post for me ! so many hobbies and so little time …. After the Castle Combe trackday last May my TR6 developed a ‘clonk’ when taking up drive. after doing nothing about this for ages, best practice i know, last week i took it to the local mot place and borrowed their inspection pit. was hoping / expecting a worn prop uj, or maybe driveshaft cv…. But these were all fine. the diff has some backlash but thats been the same for the 10 years i’ve owned it! testing in and out of 1st/reverse with the engine running the rear of the diff moved up and down quite a bit. back in 2013 i fitted new rubber rear mounts, the fronts are poly ( i was advised this combo was a good compromise between control and noise) Today i replaced the old mounts with superpro blue poly mounts…. And the clonk is gone ! easy job apart from getting the exhaust box off, it was happy in the car and reluctant to leave ! the old mounts were shot, the inner steel tube being detached from the rubber. heres a few pics : steve Edited February 23, 2023 by Steves_TR6 Spelling! Quote Link to post Share on other sites
Tim D. Posted February 23, 2023 Report Share Posted February 23, 2023 Had the same experience. Destroyed one set if rear mounts in a summer. Fitted polyurethane and all good.. Tim Quote Link to post Share on other sites
Tony Holl Posted February 23, 2023 Report Share Posted February 23, 2023 Please wait while image is uploading... My 6 developed a clonk, thud at the weekend ! Noticed it more when lifting off ! Ditto same as you changed the rear diff mounts today and all is well again Quote Link to post Share on other sites
Peter Cobbold Posted February 23, 2023 Report Share Posted February 23, 2023 I had the pressed steel diff carrier that bolts to the nose of the diff, fracture. Gives a single knock on drive take up. Only a matter of time as these TRs age ! Peter Quote Link to post Share on other sites
CharlieBubbles Posted February 23, 2023 Report Share Posted February 23, 2023 (edited) Tom Cox at Pete Cox and Son recomends rubber mounts at the rear and polys at the front as well; his logic is that polys at the rear are a bit fierce and risk cracking the aluminium rear diff housing. Edited February 23, 2023 by CharlieBubbles Quote Link to post Share on other sites
Mark V Posted February 23, 2023 Report Share Posted February 23, 2023 Hi Steve, have you noticed any difference in noise or vibration in switching to the poly Bushes? Quote Link to post Share on other sites
Steves_TR6 Posted February 24, 2023 Author Report Share Posted February 24, 2023 Only had a short test drive so far and couldnt notice any more noise the poly’s are stiffer than the rubber mounts so we’ll see how the ally dif housing fares over time i do drive the 6 ‘enthusiastically’ including the odd track day Quote Link to post Share on other sites
JohnC Posted February 24, 2023 Report Share Posted February 24, 2023 When I fitted purple Superpro poly bushes many years ago I was under the impression they had the same stiffness as the original rubber. There were alternatives which were stiffer. Is that now not the case? All I noticed on my car was lots of missing noise - no increase in harshness. J Quote Link to post Share on other sites
Steves_TR6 Posted February 24, 2023 Author Report Share Posted February 24, 2023 3 hours ago, JohnC said: When I fitted purple Superpro poly bushes many years ago I was under the impression they had the same stiffness as the original rubber. There were alternatives which were stiffer. Is that now not the case? All I noticed on my car was lots of missing noise - no increase in harshness. J Yes, i remember red,blue and yello poly. and the front mounts on my 6 are yellow But these days blue superpro seems de-rigeur Quote Link to post Share on other sites
JohnC Posted February 25, 2023 Report Share Posted February 25, 2023 20 hours ago, Steves_TR6 said: Yes, i remember red,blue and yello poly. and the front mounts on my 6 are yellow But these days blue superpro seems de-rigeur I could see the ones I fitted as a purply blue 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.