[PropanePower]

what is a posi? isnt it a rearend that makes both wheels spin.
what is a limited slip? isnt it a rearend that lets the right wheel spin yet not the left one. and for you dodge boys is a suregrip rearend a posi or a limited slip.

[jimfulco]

Positraction, Sure-Grip, & Traction-Lock are all "trade names" for limited-slip differentials made by GM, Chrysler, & Ford, respectively. Limited-slips send torque to both sides using clutches, but the clutches will slip some under certain conditions, such as turning under light throttle. The more torque you put into it, the tighter the clutches hold, causing both wheels to turn.