My good buddy had his 8-3/4 rear gears installed and setup by a guy from Dial Transmission in Bellmore/Wantagh. He seemed to have done a good job as it is quiet, smooth, and completed a track day with a bunch of mid-high 11 sec runs. 1.60s 60 ft. 70 Charger 500 @ about 3800-3900 lbs. that’s ok in my book.
Not sure of his name there.