[TR] TR6 tranny sound?

[Tim Gaines]

I've had a few suggestions that I've ruled out such as wire wheel 
splines and loose wheel lugs, and a few other ideas that I'll check 
out, but I don't think I've gotten the answer to the noises yet.  I'm 
now wondering if the speedometer cable could be responsible for the 
"zzzup" sounds I am hearing.  It seems likely that it would make 
noises at takeoff but then quiet down (or maybe just get high pitched 
and less noticeable).  But I'm not sure why I wouldn't hear anything 
with the car up on jackstands and the wheels under power.

Tim


At 06:00 PM 5/15/2012, you wrote:
>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
>
>** triumphs at autox.team.net **
>
>Donate: http://www.team.net/donate.html
>Archive: http://www.team.net/archive
>Forums: http://www.team.net/forums
>Unsubscribe/Manage: 
>http://autox.team.net/mailman/options/triumphs/mtgaines@mail.presby.edu