Driveline Angle Measurement
Driveline Angle MeasurementSpecial 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. For additional information, refer to Vehicle/Testing and Inspection.
1. Check the vehicle for evidence of overload or sagging. Check for specified air pressures in all 4 tires.
2. Normalize the suspension.
3. Drive the vehicle onto a drive-on hoist or back onto a front-end alignment rack.
4. Inspect the suspension and chassis. Verify that the vehicle curb position ride height is within specification.
^ Measure the curb position ride height with the vehicle empty and all fluids full.
5. Place the special tool on a clean, flat level section on the bottom of the frame rail. Press the ALT ZERO button to calibrate the inclinometer to the vehicle.
6. For the driveshaft angle reading, place the special tool flush against the bottom of the driveshaft. Check and record the reading.
7. Calculate the difference in the slope of the components to determine the universal joint operating angle.
^ When 2 connected components slope in the same direction, subtract the smallest number from the largest to find the universal joint operating angle. When 2 connected components slope in the opposite direction, add the measurements to find the universal joint operating angle.
^ The universal joint operating angle is the angle formed by 2 yokes connect by a cross and bearing kit. Ideally, the operating angle is the angle 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 continuous operating angle.
8. To check the pinion angle, rotate the driveshaft so that the rear axle pinion flange yoke ear is parallel to the floor. Remove the U-joint snap ring, then install the special tool. Check and record the pinion 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.
9. To check the engine angle, rotate the driveshaft so that the slip yoke ear is parallel to the floor. Remove the U-joint snap ring, then install the special tool. Check and record the engine angle reading.
^ If the angle is not within specifications, repair or adjust to obtain the correct angles. Inspect the powertrain/drivetrain mounts or frame rails for wear or damage.
