456 GEARS

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**BARRY** · #1 10-19-2006, 06:41 AM

HI CAN SOME ONE TELL ME THE RING AND PINION NUMBERS FOR FACTORY 456 THANKS BARRY

**Mr70** · #2 10-19-2006, 07:12 AM

GM Part #3917973

**Mr70** · #3 10-19-2006, 07:44 AM

..and #3961410 also before Mar.1972 for ALL Vehicles.

69L72RS · #4 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.

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