How low?

[someotherguy]

You raise the center support bearing with the spacer kit. That solves the pinion angle issue...lowering that much straightens out the driveline; using the carrier bearing spacer re-introduces some angle to it.

Richard

 

[skylark]

Richard, I have always pointed the pinion at the tranny or transfer case. Are you saying that the drive shaft should have some angle to it?

 

[ccreddell]

No, the pinion and the tail shaft planes should be parallel-always (actually, the nose of the pinion should be down a couple degrees to compensate for axle rotation under throttle). But on an extra-cab, when you do a flip kit, the pinion, center support, and tail shaft are all on the same plane. U-joints are a lot happier if they actually have some angle to them, so, spacing the center support up 1/2" gives it a slight angle.