Can someone clear this up for me for once and for all? My understanding is that positraction was the term GM used to describe their limited slip rear diffs. I think this confuses me because some definitions seem to say limited slip sends more power top the slipping wheel but not equal so tires won't chirp around a turn. They then say posi sends equal power to both and thus will chirp on corners. Are they confusing posi for a locking diff? My 60 suburban has posi. My 95 Yukon has a G80 Positraction/ limited slip diff....unless its the heavy duty one line my 12 Yukon xl. My 03 burb has a locking diff, I believe. My 12 Yukon xl Denali has a heavy duty g80, which I understand to be locking and not locking. What gives here?