Speed and not RPM dependent vibes from the rear?

Im thinking maybe the U-joints. Any thoughts guys?

It doesnt matter what RPM the engine is at the vibes increase and decrease according to the speed. They occasionally stop all together for 1 or 2 seconds at a time and the ride is completely smooth. Then the vibe starts again.

What do you guys think?

96 4 door AUTO 3.5 RE w/ 33's np231

Thanks!

Yeah that will be related to something in the drive train. If it went up and down with rpm it would be in the engine/tranny

So the U-joints should be my first stop then. Great, I love changing them lol

Once you get past the transmission/transfer case output shaft, engine speed ceases to be a factor in vibrations. Think universal joints, wheel bearings, or (possibly) differential bearings.

Except for the pinion bearings (and, to a small extent, the differential carrier bearings,) all are relatively easy to replace. If you do not have a C-clip axle, a press will be required to change the wheel bearings (as they are pressed onto the shaft.)

Oddball thought, check your tires, if the cords have seperated internally, they can produce those same vibes.

Quick way to check if it'd tire is to swap front to back and back to front (basicaly, rotate them), if the vibe then transfers to the front then it's tires, if doesn't transfer, then it's drivetrain related....

poorboy_616 said:

Oddball thought, check your tires, if the cords have seperated internally, they can produce those same vibes.

Quick way to check if it'd tire is to swap front to back and back to front (basicaly, rotate them), if the vibe then transfers to the front then it's tires, if doesn't transfer, then it's drivetrain related....

Click to expand...

Good point, I'd forgotten about tyres.

Quick additional thought - check your wheels for small clean spots - it's also possible you could have thrown a weight. Not all wheel weights mass three or four ounces - I've seen them down around a quarter-ounce or so, and that could cause a much smaller vibration.

Be sure to check the inside surface of the wheel (flat area between the web and the inside flange,) as some weight stick on - and those are usually fairly light weight.