I would recommend getting a T-lok installed at the same time. Right now you have an open differential which means only the right wheel is getting power under full throttle. It shouldn't costs any extra to get a T-lok installed at the same time.
Depending on where you go you might also need an install kit (shims, etc)
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"I'm not driving too fast...just flying too low"
Mine:
-87 ranger- broke
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
Our's:
90 7up vert - new project
i recomend getting the install kit before the shop its only like a 100 bucks give or take, might as well buy a tloc too before you get them install save yourself some money
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1989 5.0 - Mustang Brandy the NOW It can Barely Idle B**ch
1999 Jeep Cherokee Sport 4.0 - Yeah Its Gotta Baby Dick Lift