I recently had a 12 bolt with 4:11's installed. At the same time I had a Spohn adjustable torque arm and lower control arms installed. I did my 3 - 10 mile break in drives. And This morning I took it over 65 for the 1st time and once I hit 65 it felt like I had really nubby tires on the rear (like you would have on an off road 4x4) The car drives fine other than that. Could my TA pinion angle not be adjusted correctly?