Rear Posi Stuck

Hey everyone, I was wondering if anyone knows anything about the rear posi trac axles on a 91 chevy S-10, it is the Eaton posi unit and it is stuck in the Posi position, my tires chirp around the corners and it had a major push on the front when turning...anyways i have had the pot off and nothing appears to be broken , and i assume it is the clutch packs that are giving me the trouble...but they normally break so that posi doesn't work, not so it stays locked.....anyhow if anyone has had this happen in the past and can help it it would be greatly appreciated. Thank you for your help in advance.

Fox

try adding some posi friction modifier

yeah i forgot to mention that when i had the pot off, and put it back on, i filled it with new gear oil and that GM friction modifier (AKA whale oil), but thanks anyways. Peace