[6pack] Differential Carrier Bearing Shims

[brian at asmoothmove.biz]

Dear Bob:

 

I replaced the OEM half-shafts with the Revington TR up-rated slider units
last year. They have eliminated some of the drive-line slop and took care of
an irritating low-frequency vibration. I highly recommend them. I'm now
having my carbs rebuilt by Paltech so am taking the opportunity to eliminate
the rest of the clunking while the vehicle is out of service.

 

When I took my diff apart, I could see that as I turned the pinion with both
sub axles under load (as in a straight, standing start), the smaller
differential/spider gears would "walk" and then slide on the shaft pin and
hit the carrier with a "thump". There is apparently too much clearance
between the gears and carrier; the current .060 shims (worn to .050) are
insufficient. My plan is to use thicker shims as supplied by TR to take up
this excessive clearance. As a result, the spider gears should make better,
and slightly different contact than they had been. Anyway, that's my theory
at this time!

 

 

Brian

 

 

 

From: Bob Rochlin [mailto:r_rochlin at hotmail.com] 
Sent: Wednesday, June 30, 2010 5:49 AM
To: brian at asmoothmove.biz
Subject: RE: [6pack] Differential Carrier Bearing Shims

 

Hi Brian,

          I have a 72 TR6 with, what seems to be, an un-diagnosable clunk.
Have you looked into the possibility that it may be the half shaft splines?
I'm really interested in your rebuild results.

          Good luck and take care.

          Bob

> From: brian at asmoothmove.biz
> To: 6pack at autox.team.net
> Date: Tue, 29 Jun 2010 20:33:09 -0500
> Subject: [6pack] Differential Carrier Bearing Shims
> 
> Does anyone on the list know if there were standard sizes for the
> differential carrier bearing shims? I've measured all of mine as I
> disassembled it for a rebuild and find most are .003, .005 or .010;
however
> there some that measure .011 and .0055 and .006. I tried to remove all
> traces of matter from the shims before measuring and I've also tried to
> minimize measurement error (am using a calibrated micrometer). TRF lists
> only the three sizes mentioned in the second sentence and I am inclined to
> believe my oddballs started life as the ones listed, but who knows? I
cannot
> re-use the original shims.
> 
> My goal is to take out the annoying clunk caused by excessive spider gear
> backlash with thicker shims and change out all bearings (except the
pinions
> - I know better). Surprisingly, the crown and pinion are in very good
> condition.
> 
> Brian J. Alwin
> 1972 TR6 CC79085
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