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BARRY
10-19-2006, 06:41 AM
HI CAN SOME ONE TELL ME THE RING AND PINION NUMBERS FOR FACTORY 456 THANKS BARRY
Mr70
10-19-2006, 07:12 AM
GM Part #3917973
Mr70
10-19-2006, 07:44 AM
..and #3961410 also before Mar.1972 for ALL Vehicles.
69L72RS
10-19-2006, 07:09 PM
GM Part #3917973 is stamped 3916230-3916231 = HD parts list
special heat treat

GM Part #3961410 is stamped 3862514-3862516 = Standard production

Both part numbers overlap back to 1967, I think.