Never tried putting a GM rearend in a bird before. This should prove interesting.
But, if what you meant was a traction-loc, then yes, follow the link above for your info. For gears I would say at least 3.73's, maybe even 4.10's. These cars a heavy and having good gears and a higher stall TC help get them moving.
These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.