Hmm, I believe I got the whole brake problem almost sorted out. I still have a small vacuum leak, but I'll look into that tomorrow. This evening I went to pull my truck out of the shop for another test run after nearly completing my SAS, and as I began to drive, the rear drive shaft came apart. The splined end came out of the yoke. Of the many posts that I've read, I haven't seen anyone replacing their rear drive shaft. I assume that the drive shaft came apart because I gave it some gas, causing bad axle wrap, disconnecting hte drive shaft. When I look at the drive shaft, the splined part only goes into the yoke about 3/4". I have Pro Comp 3.5" lift blocks along with 63" chevy rears. anyone else had this problem? Currently, my truck is sitting 1"-2" higher in the rear than the front. I could cut 1" off of the lift block, but after doing the math, I would only gain around 1/2 of drive shaft. THIS SUCKS! anyway, tell me waht you think.