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Tta Rear End Grinding Noise

S

Spendright

New Member
Here's my problem...
Had the differential fluid changed for the first time a month ago and then went on a 300 mile trip. Car has 32,000 actual miles on it.
At the 400 mile mark, I noticed that the rear end would shudder a little when in reverse. Nothing bad, but noticeable. 100 miles later and I just came back from a quick expressway (70mph) trip of 25 miles and the car made a huge grinding noise from the rear when I applied the brakes off the exit ramp. Limped home, turned into the drive and the grinding noise is very obvious and can be heard when in first, and quite loud in reverse. Any ideas?

I had all rear bolts inspected, tires yanked on and rotated on a lift, the u-joints are tight and no noise when running in 1st gear on a lift. An ideas???
 
Caught my attention that you said you had the tires rotated. The rims are fronts/rears only. May have nothing to do with your problem, but check to make sure they didnt put them on incorrectly.
 
kymmee said:
Caught my attention that you said you had the tires rotated. The rims are fronts/rears only. May have nothing to do with your problem, but check to make sure they didnt put them on incorrectly.
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Yup. Thanks for the suggestion, but they are on correctly.
 
robert lee said:
Are you sure the noise is not coming from the trans ? Did you double check the fluid levels ?
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Had a real good tranny guy look at it today and luckily, his garage is also well known for rebuilding 9-bolt rears. Said the problem is in the rear end and will be opening it up next week. Probably going to cost a pile of money, but want it done right.

This guy teaches tranny and rear end repairs at the local trade school. Has worked on most muscle cars in the Lansing area for the past 30 years. Real old school.

Thanks for sharing your thoughts....
 
I'm not that familiar with the 9 bolts....do they require an additive for the differential? I ask because you said it was quite, then you changed fluid, and now there are issues, turning into a driveway, etc.
 
This is the very issue that trips up a lot of tta owners, bottom line is the trans and rear were not designed to handle the HP the eng. was putting out, that is why PAS rated it that low because the manufacturer would not warranty the parts to repair.. on the other hand drive them like your daily gas miser and they will last a long time.
I mentioned why most people thought it was underrated to Scott Kelly at the reunion and he looked at me like i had green skin and one big eye....
 
Thanks for the info. Will post a final summary once my car is looked at and repaired. Funny though, because everything is fine if I only drive 4-8 miles. Only longer trips make this rear end growl...
 
^^^^^^
Because it take's that long to heat up.. same thing will happen when a trans is on the way out... these are very finckey cars to start with... not for the faint of heart but very enjoyable when right....:)
 
This great old school car repair shop in Lansing Michigan (Enhanced Performance) took the entire rear end apart and all gears, bearings, cone, springs, etc. look factory new. Best guess is that the shop I took it to for it's first rear fluids change (since birth) in early June did not add that special oil additive (small tube) when they changed the fluids. These great guys put the rear back together and it runs smooth and quiet.

Saw similar claims on the Internet, but thought it was too good to be true. This honest shop saved me a ton of money.

Thanks to everyone for weighing in on this issue.
 
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