Good used 3.36 ratio OEM GM 11-37 (11 pinion teeth, 37 ring gear teeth) ring and pinion set for the '64 -'72 Chevy 8.2" 10-bolt rear, lightly bead blasted for cleanup. $80 plus shipping. Checks or money orders only please, I don't use PayPal. Please send me a PM if you're interested, thanks.