[TR] [6pack] Rear end clunk

[johnbmacartney at gmx.com]

Even when the cars were new, it was an accepted fact at the factory that differential units, were inherently noisy. They howled or moaned or rumbled and this issue affected the whole model range. It was unusual to find a car with a quiet one! Many different ‘cures’ were tried and the only moderately successful one was to change the machining angle of the gear teeth. The axles were all bought-in components from (I think a company called Salisbury) who maintained that modifying the manufacturing process (angle of gear teeth cutting) would result in a higher cost price which the Purchase Department refused to consider, so we were stuck with noisy axles. End of story.



Jonmac



From: Greg Lemon <grglmn at gmail.com>
Sent: 27 January 2022 15:28
To: Alex & Janet Thomson <aljlthomson at charter.net>; Triumphs <triumphs at autox.team.net>
Subject: Re: [TR] [6pack] Rear end clunk



I chased after a "rear end" clunk for years.  Decided it was in the differential, and decided to replace it with a Nissan R200 limited slip after replacing u-joints and checking mounts many times.  When I was installing the differential and new, shortened drive shaft I discovered one of the transmission mount bolts had gone missing.



If you are not finding it, may be worth expanding your search, however, the only when cold thing is a bit of a head scratcher.



BTW, very glad I did the diff swap, even though it was not the cause of the clunk, car is much quieter, especially  with the top up.



Greg Lemon

TR250



On Thu, Jan 27, 2022, 9:10 AM Alex & Janet Thomson <aljlthomson at charter.net <mailto:aljlthomson at charter.net> > wrote:

Don’t rule out worn driveshaft U-joints or worn/loose mounting bushings on the differential itself.



Alex Thomson



From: 6pack [mailto:6pack-bounces at autox.team.net <mailto:6pack-bounces at autox.team.net> ] On Behalf Of otral at juno.com <mailto:otral at juno.com>
Sent: Thursday, January 27, 2022 9:43 AM
To: 6pack at autox.team.net <mailto:6pack at autox.team.net>
Subject: [6pack] Rear end clunk



Twenty years of rear end clunk when I put it in reverse with cold engine and I'm tired of it. But as soon as the engine warms up it disappears and i dismiss it. Do I bite the bullet and get it checked out? I'm sure my mechanic will say get it fixed. And how much do you think a repaired rear end will cost me?



Al in CT with 74 French Blue



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