So being that I'm doing an Ls swap the rear end pretty much needs replaced with something stronger and it wouldn't hurt to upgrade the front brakes either so if I use the disc rear end and front disc from a 4th gen ls1 can/should I use the master/booster setup from the 4th gen I know the prop valve will have to be changed because right now I have a disc/drum setup.

 

Should is up to you. Benefits of a 4th gen master/booster are smaller physically and newer, i.e. not worn out from 2 decades of (ab)use

4th gen boosters all interchange, LT1 masters use a different brake line thread, LS1 masters are a direct fit

 

What year and channel rear end doesn't have abs or traction control?

 

Does it matter? Without the abs module, it makes no difference

 

Well.... With the 4th gen complete harness the abs wiring is there but I'll wind up tracing and depinning the wires for the abs and removing them

 

By moving absolutely everything over, you have to choose to swap in the ABS module or not. Not bringing over means the dash light will come on. Pop the bulb out, problem solved

 

Yea pulling the bulb is what I was going to do so any rear with or without abs/tc will work