So if I change to fourth gen rear end with disc brakes what do have have to change. I have drum brakes now. I have a set of 4th gen ws6 16" wheels at the house, how for will they stick out on each side. Are the different rear ends of 4th gen cars. Like the ones for trans am better the the formula etc.

 

you will want to get the master cyl. and proportioning valve that goes with the disc brake rear as well as the e-brake cables.

 

You will also want to Sell Me Your Old, Useless 28 SPline Axles ( If you currently have a 10 bolt
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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype