Question: what is the difference between posi traction and limited slip?
Answer: TOM: Actually, Jeannie, "posi-traction" is just Chevrolet's name for limited slip differential on passenger cars. ... RAY: On Chevy trucks, limited slip is called "locking differential." That's just a heavier duty version of "posi-traction," and it operates ONLY on the rear wheels, even if you have four-wheel-drive.