Originally Posted by wolffcub
Acceleration in 5th is nothing spacial. It will be worse soon as im changing to a 3.42 rear soon. Im running tires that are smaller than stock so the 3.42 is where i need to be.

The vibration seems much more sever than a bearing. It feels like someone is jumping very quickly in the rear box.

I know you have been careful thoughout your installation. However, is it possible that the pilot tip bushing is the wrong size? IIRC, you used a Jeep 10 spline shaft to modify the T5 you have, which also means that you only cut about 3/8" off the tip of the Jeep IS. I will also assume you have a 1 piece drive shaft. If you have a 2 piece DS, then check the carrier bearing. I'm just thinking out loud here.

Try coasting down a steep hill with the engine off and the tranny in neutral and then try again with the clutch pedal depressed and see if the vibration occurs.

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