Ok, I have a weird question. I have a 1971 Coupe Mustang, and to be honest I want both tires to spin when I do a burnout. What are some options to deal with this, and what rear end would you reccomend?

 

First of all if you wanted a "posi" rear end you would be installing a Chevy product. Not trying to be difficult that is just a pet peeve of mine that all factory locking differentials are called "posi� which is the Chevy version. Our cars are better than to be lumped in with Chevy parts. What you are looking for is a "trac-lock" differential. Does your 71 have a 9"? If so there are many options. A locking or limited slip differential can be had for between $300-$900 just for the differential, and then you have the rebuild costs on top of that. One of the best sites I have found for 9" rear ends is www.ultrastang.com

 

Yeah, sorry did not even know that was a chevy product, i was just starting something that will lock both tires together, lol, but thanks for the site.

 

gm ford and dodge have there own names for a lsd. theres many types you can use find out if you have a 8 inch or 9 inch rear end. stay away from a mini spool or spool those aint good on a street car. id go for a clucth type lsd or a air locker.good luck let us know which one you get.

 

There are several types, clutch type limited slip such as the trac-lok and posi, use clutches to put torque to wheels with traction, but it doesn't provide 100% power to both wheels, but still works well. They generally require friction modifiers to be added to the gear oil, and they clutch packs eventually wear out. If you go that route spend the money and get the carbon clutches.

There are worm gear types like the Torsens and Eatons True-Trac I think it's called? That are like a LSD mentioned about but don't have clutch packs(generally), they use gearing inside to accomplish the same.

Then you have lockers, like the Detroit or Richmond Powertrax(which is what I have). Typically a locker will require a change in driving style to some degree. They provide for a solid locked axle when you accelerate hard or are going straight, but when you turn while driving normally unlock so the tires can turn at different rates. They generally make noise, or cause push/pull in turns as you change the throttle. Lockers are good for cars that are street driven but geared mainly towards straight line acceleratiohn like drag racing. LSD types are good for all around performance