Originally Posted by S197Miller
So the other day I took my car for a ride. And noticed that it has a vibration under a load. I can't recall of it's always done it. Or if it just started. I recently changed to 4.30 gears and completely rebuilt the carrier. When I'm driving in any gear at about any speed I can feel the vibration, but if I put it in neutral while coasting, no more vibration. I have no gear whine and everything came into recommended specs on the gear swap.
The car had really bad wheel hop after the install and I think it's do to the stock upper control arm. The lowers are aftermarket but pretty old. Other mods include poly motor mounts, chromoly flywheel, stage 3 clutch, and rebuilt motor. I could any advice as where to start before I begin pulling the car back apart. Thanks.
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My rear u-joint (I don't know if rear is the right term, I mean the one the attaches to the differential - not the trans) went bad shortly after doing my gear swap. Judging by your mods and clear understanding of cars, I'm willing to bet you have already thought of this and cleared it as a possibility though. I wasn't quite as smart and it took me awhile to track it down. :p
Does you car shake when you're in gear and coasting? At 35? 55? Or does the shaking only occur during acceleration?
If you can get it to shake when your just coasting it would have to be a driveline error. In my cases with vibrations it's always been relative to driveshaft problems(any speed) or poorly aligned wheels (higher speeds).
Edit: once I had a bad transmission brace/crossmember that had sunken in allowing the transmission to move around under load and causes the car to shake pretty bad. Might be worth checking that out, if you haven't already.
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