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Need to know the current GM part #'s for the Posi fluid and additive for a 63 posi diff.
I don't have the current numbers handy, only what was used about 10 years ago. But if you go to Corvette Central, Ecklers, or perhaps Zip and check for AC Delco rear axle lube you will see the bottles and their part numbers.
You can order from them or try for better prices someplace else. I normally just order from them.
JohnZ’s part number is correct for the additive marketed under the GM Vehicle Care line. However, I believe the additive marketed under the AC Delco label (# 88900330) is becoming more widely available now. All of the information I can find says it’s the same additive just different marketing/labeling. You’ll even find the AC Delco line sold in different looking containers.
Last edited by Mike67nv; Jul 30, 2015 at 07:32 PM.
