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Ford 9" differential clutch pack

1142 Views 6 Replies 4 Participants Last post by  jeff swisher
Diagnosing a problem with a Ford 9"..It's been 8 years since installing the new POSI carrier and gears.

When turning corners it appears that the clutch pack is not gradually slipping because half way through the turn the rear end lurches, sometimes rather violently. I suspect that the clutches are worn and "sticking" but it could be something else.

I drained 4 oz. of oil and re-filled with Ford type friction modifier hoping to resolve the problem but after driving a few miles and numerous corners - no luck.

Any idears ?:(
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figure 8s in the parking lot until they run you off......
will help work the additive into the clutches , and maybe add a second bottle, won't hurt anything
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