I always liked finding GPs with limited slip units. While the A-bodies with 3.08 and 3.23 10-bolt limited slips were 2-pinion limited slip units, the GP came with 4-pinion units. GP rears are easy to identify, the 69s had a flat spot on the top (for the exhaust maybe?). Anyway, they are good rear ends.
If your 4-spd had a/c, it should have come with a 3.23 limited slip. I junked a 69 SJ 4-spd out many years ago, still have the block and might have the rear end. I'll check next time I'm at my storage location.
Mike
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