I am swapping out the stock rearend out of my sonoma for one out of a 4wd blazer with factory disk brakes. I am sure both trucks have the same booster and M/C but are the proportioning valves disk/drum specific? I am not sure if one brake setup requires more pressure than the other or if I can just swap it and have no problems. I know theres at least one brake expert here. Thanks in advance.