limited slip chatter while turning

Not much action on yukon site so im trying here. Ive got a 2000 yukon yesterday while turning sharp left to park it felt like 4by4 on dry pavement. The rearend left tire was locked like in 4 x mode and squeeling as it spun. I just a while ago drained some fluid and added the additive for limited slip. Still did it but i know it may take a little but was wondering anything else i should check or just wait and see... DAVE

Sounds like the locking diff ( this is not full time posi) is stuck locked, possible governor problelm the Eaton g80 unit was problematic and this is one of the symptoms, normallly they are not repairable.

Maxwedge thanks for response once i straightened up it went away both times it did it. Right now its fine but i havent tried the hard left again yet does this make sense thanks dave