its a great upgrade you got. the stock v6 rear end is a 7.5" rear. its a good rear but doesnt take much more than about 300rwh and it will fail. the 8.8 is what is found in the gt mustangs and can take an assload of power. even stock. As for the performance part, your car most likly had gears that were lower than 3.27 which is the gear ratio found in the GT's. So thats why your car feels quicker.
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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