Where I can find positive traction for a Ford Mustang Gt 2000, and what I need for parts?

 

You already have it. Ford Calls it Trac-Loc. Posi trac is what chevy calls there locking diffs.
If your looking for parts to repair yours start with 50resto.com

In the 1950's and 1960's many manufacturers began to apply brand names to their LSD units. The most famous of these was Chevrolet's "Positraction". Since then, Positraction (often shortened to "positrac" or merely "posi") has become a genericized trademark for LSDs.
Other factory names for LSD's include
Pontiac: Safe-T-Track
Ford: Equa-Lock and Trac-Lok
American Motors Corporation: Twin-Grip
Mopar: Sure Grip

 

[sm=hail.gif]You are the Trac Loc God....LOL

 

put an eaton posi unit in it. Its a lot of fun and well worth. Well i can't say that because i didn't pay for it. But you have to be really really careful if you drive it around normally.