usually if you lift the rear axle off the ground and turn the tire only one
will spin. that means you have a plain oped diff. if both tires spin THE SAME
DIRECTION than you have a posy or limited slip. ( same thing)
bnow youll need to use a limited slip additive if you do have a LS axle than
yu need to use the stuff. actually i use it in all axles because it keeps
the oil from foaming and its not that much 5 $ or so. the best additive is
actually the stuff GM makes.
Rob
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