A little embarrassed to admit but I missed something simple. First Imagine the brake pedal not hooked up, we mount the master cylinder and notice resistance about 3/16" from being seated. I did have pedal free play adjusted correctly (1/4") but never thought about the rod in the booster itself being too long. Pulled it out, did sme measuring and found, sure enough, it was pushing the valve in 3/16 when mounted. The booster wasn't adjustable like some I've noticed so pulled the rod out and ground 3/16" off the end. Remounted and bled brakes. The rears don't seem to be dragging anymore. Dustin made his way back home and said his wheels are no longer hot.

But I did notice while using the brake pressure guage (with the prop all the way out.....least amount of rear bias) that at best he only gets 600 psi. But under driving conditions with a panic brake it still tries to lock up the rears with the fronts. Starting to think my new gauge is bad. Going to hook it up on my 04 truck and see if it's still low.


Thanks everyone for inspiring me!