Rear End Swap 7-1/4" to 8-1/4"

Yeah, I also used this thread last month when I did the 7 1/4 to 8 1/4 swap. I chose 75W90 Valvoline oil and even though it claimed to have the limited-slip additive, I had some chatter in my "new" sure-grip differential until I added a bottle of Mopar friction modifier. I should have read post #14 again before putting the car back down on the ground, as one of my rear shackles got flipped upward into the trunk when I set the car down.