Quote:
Originally Posted by jholley
I installed it like it was, old u-joints, carrier bearing and all, it didn't change the vibration at all. Yesterday I put a set of u-joints and a carrier on that old driveshaft and still had exactly the same vibration.
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Ok - so that rules out driveline hardware, like u joints and/or a bent or imbalanced shaft...but not driveline angles.
Quote:
Originally Posted by jholley
It is RPM sensitive though, not speed. I don't have a tach but I can recreate the vib at lower speeds in a different gear. That tells me the problem is somewhere between the motor and the pinion gear. I'm pretty sure it isn't the motor or the driveshaft.
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This is interesting, because driveline would definitely be speed related. Can you re-create the problem by running the engine up in neutral? How about with the vehicle not moving, like with the rear axle up on jackstands? (play with the driveline load by gently varying brake pressure).
The fact that it is a "boom/beat" still implies to me that there are two things going on, not just one...
K