my car only spins 1 wheel, wondering if all maros have posi?

 

I know all the LT1s have a posi, I'm not 100% sure but I wanna say some or all LS1s have a Torsen (if somebody can clear me up on this please do). At any rate all Zs and SSs are supposed to have some kind of LSD. Sounds to me like you may have a broken rear end. That or possibly one from a V6. Yeah.....I wasn't that much help there. Hopefully somebody else can give you a better answer.

 

i heard they all have limited slip but not all have posi, what is the difference?

 

To put it as simply as possible, a posi locks the rear wheels together and makes them both spin at the same rate while still allowing the tires to spin at different rates around corners. A Torsen on the other hand can adjust the torque load on each wheel. For example if the left side starts to slip it will shift more of the load to the right rather than keeping both sides going full bore like a posi would. Both are considered an LSD, they are just different types.