Tranny Problem??
Thread Starter
Staging Lane
Joined: Mar 2004
Posts: 54
Likes: 0
From: Houston
Tranny Problem?? Was cruising around tonight, and got on it a couple times, and the last time when the car shifted from 1st-2nd, and 2nd-3rd there was like a "thud" sound. Felt like i ran over something, but I didnt. Felt like it came from the tranny. Any ideas?? Thanks.
TECH Senior Member
Joined: Jun 2003
Posts: 9,339
Likes: 3
From: NYC metro area
It's probably the tranny mount. The stock rubber mounts take a **** quite often, especially on LT1 cars where the rubber is old and has seen a lot of **** over the years. Mine was totally shredded in half- it would thud like 20 times in a row during acceleration. That was pretty damn scary, I thought I'd dropped something in the tranny itself. A polyurethane mount would be the strongest choice, but you may see some vibration from it. I've found that the best choice is the 1LE tranny mount, but they're pretty hard to find nowadays.
To check the mount, just use a jack to support the tranny and drop the crossmember. You'll be able to see if the mount has a crack in it. Although it doesn't sound like yours is totally shredded in half since it's only one thud.
That's my guess, but it could be something different altogether. The only thing that rubs me the wrong way is the fact that you said it happened right when the tranny shifts. Does it happen only when the tranny shifts, or does it happen during heavy acceleration also?
To check the mount, just use a jack to support the tranny and drop the crossmember. You'll be able to see if the mount has a crack in it. Although it doesn't sound like yours is totally shredded in half since it's only one thud.
That's my guess, but it could be something different altogether. The only thing that rubs me the wrong way is the fact that you said it happened right when the tranny shifts. Does it happen only when the tranny shifts, or does it happen during heavy acceleration also?
Thread Starter
Staging Lane
Joined: Mar 2004
Posts: 54
Likes: 0
From: Houston
Under heavy acceleration is when it happened. 1st-2nd "thud" and 2nd-3rd "thud" scared the bajesus outta me so I slowed down. When I accelerate normally, its fine. Also, my car is an A4 and has been hitting the rev-limiter A LOT lately under heavy acceleration, which it hasnt in the past. Not sure if that is maybe a sign of something, or just what A4's do.
