I have seen it mentioned that the u-joint on the drive shaft should have 1 1/2 inches of clearance from the frame on a dirt track. My rear frame height is 4 3/4 inches from the ground, I dialed back the pinion angle to 1.5 degrees, yet I can only get 1 inch of clearance without the driver. Is the 1 1/2 inches with driver, or am I missing something?