For servicing and repairing the drive/propeller shaft, position the vehicle level at the axles and let the wheels turn. Before installing the base, take out the external bearing snap rings in the universal joint. Rotate the shaft so that the transmission/transfer case output yoke bearing cap is in the down position, if appropriate and make all your measurements from the front toward the rear. Set the inclinometer on the shaft so it is aligned with the yoke pivot or the pinion ring, on the gear side. Set the bubble in the center to mark the angle of the Transmission or Output Yoke. After that, turn the propeller shaft 90 degrees and place the inclinometer on the yoke bearing cap so it is even with the shaft and align the bubble to find the angle of the shaft. Take away the smaller angle from the larger to find out the operating angle for the gear transmission. Following this, turn the propeller shaft so that the card is perpendicular to its shaft, then lay the inclinometer flat onto the pinion yoke bearing cap, right at the bottom of the bubble to record the pinion shaft or input yoke angle. The axle Input Operating Angle is found by subtracting the smaller from the larger figure. Achieve less than 1 degrees difference in the U-joint operating angles, maintain operating angles not over 3 degrees and try for at least 1/2 of one degree of continuous operating angle for the propeller shaft.