KQ rear with 4.56 gears

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69L72RS · #7 10-13-2008, 11:38 PM

Keith,
The "KM" is the standard duty 4.56 (3862515-3862527) rear just like the "KK" is for the standard duty 4.10.
This KQ rear has the correct 3916234 posi unit and the 3917973, HD 4.56 (3916230-3916231)special heat treat, gearset in it.

It is possible that someone ordered the correct COPO 4.56 gears and replaced the 3917971 4.10 gears, but how many people knew that GM had two different 4.56 gear sets back then.

Thanks,
Eric

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