Thread: 456 GEARS
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Old 10-19-2006, 07:09 PM
69L72RS 69L72RS is offline
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Default Re: 456 GEARS
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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