Doctor Diff 8 3/4 Sure Grip

I have nothing but good things to say about Cass (dr. diff). I've used 2 of his sure grips and highly recommend them. As for gears, I think I read Motive was bought out by Richmond (or vise-versa). I've used both in the past. Always had good luck setting up Richmond. The Motive set I did was the first new setup I did and had a little trouble but I was a newbie and didn't understand everything about setting them up. First drive they howled pretty bad. Took them back apart and re-tried and that time they barely made a noise. If I would have got it right the first time they would have probably been completely quiet