Lee,
I'm not an expert, but from my experience:
1. Backlash doesn't sound like an issue.
2. If you have any play in your u-joints, you need to replace them.
3. Play in the axle splines is not good, but you could be mistakeing u-joint
play for it - test it again after replacing u-joints.
4. From your description, it doesn't sound like diff mounts should be an issue.
If I were to diagnose from your description, it sounds like your u-joints are
badly worn, and the clunk you hear is caused by the amount of play in the
u-joint.
Raymond L. Hatfield
--- On Tue, 9/9/08, Lee Daniels <lee@automate-it.com> wrote:
> From: Lee Daniels <lee@automate-it.com>
> Subject: [6pack] The TR6 rear-end clunk
> To: 6pack@autox.team.net
> Date: Tuesday, September 9, 2008, 8:47 PM
> I asked this of the Triumphs list and response was, well,
> underwhelming (one
> response to me only, none to the list). But this is really
> bugging me, and I'm
> trying to keep my driver on the road. If I end up pulling
> the whole rear end
> I'm going to be off the road for a while. Here goes:
>
> Last year I picked up my second TR6 ('74) and have been
> using it as my driver.
> Good, not great condition, but runs great and looks really
> great from 20 feet.
>
> I've got a pretty substantial clunk when I apply power
> in reverse. So Sunday I
> climbed underneath and checked out the differential
> mountings. Looks like the
> P.O. has already been there, new rubber mounts and no
> obvious cracks. The case
> looks like it was cleaned and maybe painted within the last
> thousand miles. So
> I started moving things around by hand (rear wheels in the
> air i.e. jackstands
> rear and wheels chocks front, parking brake off).
> Here's what I found, and my
> questions:
>
> 1. So how much backlash should there be in the diff? I.e.
> rotate one wheel,
> other one fixed, then reverse direction - I've got
> maybe 5 degrees of play
> here.
>
> 2. What about the u-joints? One axle has a wee bit of play
> in the u-joints -
> should they be almost completely without lash?
>
> 3. It feels like there may be some play in the axle splines
> on one side - how
> much is allowable here?
>
> 4. If there is a problem with the diff mounts, would I be
> able to detect it
> without pulling the diff first?
>
> I've got 6 or 8 spare new u-joints, so pulling the
> axles out and refreshing
> those would be "easy" (sort-of) for starters.
>
> Note that I've got wire wheels, but I started there and
> see that they seem
> tight and without play.
>
> Thanks,
> Lee
>
> '74 Maple TR6 (never-ending restoration)
> '74 Pimento TR6 - daily driver
> The Woodlands, TX
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