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[TR] TR6 tranny sound?

To: Triumphs@autox.team.net
Subject: [TR] TR6 tranny sound?
From: Tim Gaines <mtgaines@presby.edu>
Date: Tue, 15 May 2012 18:00:00 -0400
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I thought I was leaving for a nice drive of about 150 miles in the TR6 a few days ago, but I didn't get farther than the gas station before some nasty noises turned me right around. When taking off from a stop I get a crunching sound plus a "zzzup" thrown in once in a while. My first thought was that I had a stone or two from my newly graveled driveway sitting on top of the drive shaft. But I also thought it could be the tranny or the differential, and I didn't want to take any chances out on the road. I got home okay. In fact, the car ran smoothly once up to speed. It only made the sounds at takeoff. I got it up on jackstands and couldn't find any evidence of stones or loose flange bolts at either end of the drive shaft or at the rear axles. I also couldn't reproduce the sounds with the wheels off the ground, either with the rear wheels under power or by turning the front ones by hand. I also couldn't feel or hear anything when I turned the rear wheels by hand or the drive shaft with a wrench on the flange bolts.

When I got the car on the ground and found that it still made the sounds (no lucky fix!), I started thinking it might be a disc brake pad issue. It seemed like the sounds were coming from the front. Today I replaced the pads and the nasty looking anti squeal shims. In the process I rotated the rotors with and without pads in place and got no noises. However, I did get something like the "zzzup" noise when I deflected the rotor guard into the rotor while turning it. After everything was back together I made sure that the guard wasn't touching the rotor before getting the car back on the ground. Just took a drive up the road, and nothing has changed; crunchy noises and "zzzups" at takeoff, forward and backward, but fine after it's up to speed. I think I can feel a little something through the shifter when the noises occur, but I'm not really positive about that. I also think that the noises stop when I disengage the clutch, but by the time I reach speed enough for that, the noises are usually gone anyway.

So folks, what am I up against? Does a transmission make those kinds of noises when it's failing? Is there something else I should be looking at? Thanks for any help you can offer.

Tim
1974 TR6
1980 Spitfire

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