no you just need to get gears made for the 7.5" rear end and your good to go. I would however get a posi because its the same price to install gears and add a posi because the stock open differental will have to come out to add the new gears.
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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