I've parted out a lot of GPs over the years, mostly 428 cars.
Most of the 428 cars I dismantled had 3.23 rear ends. I live in NC, so most were open rear ends. The limited slip rear ends I've encountered were mostly out of manual transmission cars and 428HO cars.
I found a 69 GP 400 car with a 2.92 limited slip rear end. I also found a 69 428HO 4-spd car with a 3.55 limited slip.
I've seen a lot of 3.08 rear ends in the 70-72 400 cars.
Hope this helps.
Mike
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