Quote Originally Posted by 33toolman
I think i read once that you want the rear end offset a little so the ujoints don't freeze up and vibrate, ever hear such a thing?
Yep. On a street car, you want an offset between the pinion centerline and the crankshaft centerline. It doesn't have to be side to side (although it can be), but often it's up and down. The offset keeps the U-Joints "exercised." That's why street-driven cars the trans is usually pointed about 3 degrees down and the pinion 3 degrees up.