I am looking for 3.73 or 4.11 rear-end gears for my 1973 Camaro. Currently has a 10-bolt rear end with 2.73, 8.5" ring gear. Would like to get an 8.5" ring gear. I am also looking for a limited slip or posi differential to fit with the 3.73 or 4.11 gears. I will have to check the spline-count on the axles. I'm in Boise, ID.