Originally Posted By MoparJ
Originally Posted By gold66cuda
If the car is on the ground in the last set of pictures the driveshaft is about an 1" short.


The car is on the ground. Yes, the driveshaft could be a tad short, but I am not grasping why it's now an issue when it wasn't prior to the gear swap.


The drive shaft is now spinning about 1000 rpm faster with the 3.91 gear. The faster it spins, the harder it shakes.

The shaft looks too short coupled with the fact that the shaft has some runout according to your machinist equals vibration.

Kevin