I purchased a new Moser 12-bolt unit(69 Camaro) with an Eaton posi a few years ago and put about 3500 miles on it and never had any issues like you describe. It had a little bit of a whine to it that you could hear at lower cruising speeds but a lot of gear sets do that and it's not related to the posi unit or the housing. I remember adding some GM posi fluid from a small bottle, but it didn't require the whole bottle. I would be careful adding too much. Did Moser have any suggestions?
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Chris Robinson
1969 Camaro SS/RS, 489 ZL-1 MPFI, T-56 Mag
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