Driveline Angle Measurement

Driveline Angle Measurement

Special Tool(s):

CAUTION: Prior to checking driveline angularity, inspect the U-joints for correct operation.

NOTE: An incorrect driveline angle can cause a vibration or shudder.

NOTE: Driveline angularity is the angular relationship between the engine crankshaft, the driveshaft and the rear axle pinion. Factors determining driveline angularity include ride height, rear spring and engine mounts.

1. Carry out the following preliminary setup steps:
^ Inspect the U-joints for correct operation.
^ Park the vehicle on a level surface such as a drive-on hoist, or back onto a front end alignment rack.
^ Verify the curb position ride height is within specifications with the vehicle unloaded and all of the tires are inflated to their normal operating pressures.
^ Rotate the transmission output yoke until vertical. This will simplify taking measurements.
^ Calibrate the special tool by placing the tool on a clean, flat level section of the frame rail and press the ALT-ZERO button.
2. Using the special tool, measure the slope of the components. Record the measurements and the direction of the component's slope.





3. To check the pinion operating angle, rotate the driveshaft so that the rear axle pinion flange yoke ear is parallel to the floor. Install the special tool. Check and record the pinion operating angle reading.
^ If the angle is not within specifications, repair or adjust to obtain the correct angle. Inspect the rear suspension, rear axle, rear axle mounting or the frame for wear or damage.





4. To check the transmission operating angle, place the special tool on a flat and level surface. Press the ALT ZERO button to calibrate the inclinometer.





5. For the driveshaft angle reading, place the special tool flush against the bottom of the driveshaft. Press the ALT ZERO button to calibrate the inclinometer.





6. Calculate the difference in the slope of the components to determine the U-joint operating angle.





^ When 2 connected components slope in the same direction, subtract the smaller number from the largest to find the U -joint operating angle. When 2 connected components slope in opposite directions, add the measurements to find the U-joint operating angle.
^ The U-joint operating angle is the angle formed by 2 yokes connected by a cross and bearing kit. Ideally, the operating angles on each end of the driveshaft must:
^ be equal or within 1 degree of each other.
^ have a 3 degree maximum operating angle.
^ have at least 1/2 of 1 degree continuous operating angle.





7. Compare the operating angles. Ideally, the operating angles on each end of the driveshaft must:
^ be equal or within 1 degree of each other.
^ have a 3 degree maximum operating angle.
^ have at least 1/2 degree of operating angle.