I agree with everything Craze cars said, especially the part about the new cage nuts. Get the "new" design that is one piece instead of the prone to break clips with nut held in place. The multi-leaf rear springs have an advantage, they are the same dimesnions as the 2nd gen Trans Am. I used the highest rated spring at the time, an 81 WS-6 Trans am rear spring for my car and it works real well.
If you have a high horsepower car, I would also recommend using 4 U-bolts and eliminate the T-bolts on the axle to spring connection.
