I used a non-synthetic Valvoline gear oil(probably 80/90) and that exact 4oz bottle of GM posi fluid you mentioned, although I didn't have to use the whole bottle. Can't remember exactly how much. I think the GM bottle mentions the mixture ratio. Hopefully the simple fluid change solves the issue for you.
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Chris Robinson
1969 Camaro SS/RS, 489 ZL-1 MPFI, T-56 Mag
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