I suspect the Roadster Factory was talking about the geometry of the drive
shaft and half shafts. Of course the half shafts move but I guess there is an
optimum resting angle. The drive shaft doesn't move (we hope!) but I think that
the goal is to have the trans and the diff be as close as possible to perfectly
aligned (to the point that Ujoints aren't even needed - theoretically).
I would assume that anything less than optimum would cause the Ujoints to wear
out prematurely and maybe even the diff bearings.
In the real world, I would think that anything less than 1/16th" on one mount
would not make a measurable difference in wear and hopefully not a noticeable
difference in noise. I would risk my car on that guess but you might feel
uncomfortable with that risk.
Ed McGuirk
76 TR6
86 Rx7
88 MR2 Supercharged
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Date: Mon, 18 Sep 2000 23:55:20 -0700 (PDT)
From: tr6taylor@webtv.net (Sally or Dick Taylor)
Subject: Re: TR6 diff mount bracket crack. Repair suggestions?
Walt---The good folks at TRF usually know what they're talking about,
but I really don't know what "geometry" they're referring to. Of course
it would be better to install a new diff mounting piece, rather than
repair a broken one. If this is not an option, go ahead and repair it as
planned. You woud have to be better off than before, when you were
riding around on one that was cracked and clunked! Rear wheel alignment
should stay as before you did this, and would only need to be changed if
it were already out of specs.
Dick T.
'73
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