Pinpoint Test H: Driveline Vibration - Occurs At Cruising Speeds
- Normal Operation and Fault Conditions
The driveline system enables the power generated by the engine and transferred through the transmission and, if applicable, transfer case, to place the vehicle in motion. Rotational torque received from the transmission or transfer case is delivered to the front and rear drive axles by way of the driveshafts. The U-joints or CV joints at the ends of the shafts allow the shafts to rotate smoothly in an allowable angle plane. The rotational torque is introduced into the axle differential which drives the axles/halfshaft.
Possible Sources
- Worn or damaged driveshaft center bearing support
- Center bearing bolts not seated properly
- Loose axle pinion flange bolts
- Excessive axle pinion flange runout
- Driveshaft is out of balance
- Binding or damaged driveshaft CV joint and/or U-joint
- Excessive driveshaft runout
- Driveline angles out of specification
- H1 CHECK THE DRIVESHAFT CENTER BEARING INSULATOR FOR DAMAGE OR WEAR
- Check the driveshaft center bearing insulator for damage or wear.
- Rotate the driveshaft and check for rough operation.
Was wear or damage found?
Yes Install a new driveshaft as necessary. REFER to: Rear Driveshaft . No GO to H2 - H2 CHECK FOR CENTER BEARING BOLTS NOT SEATED PROPERLY
- Check for center bearing bolts not seated properly.
Are the center bearing bolts not seated properly?
Yes Tighten to specifications. REFER to: Rear Driveshaft . No GO to H3 - H3 CHECK FOR LOOSE AXLE PINION FLANGE BOLTS
- Check for loose axle pinion flange bolts.
Are any bolts loose?
Yes Tighten to specifications. REFER to: Rear Driveshaft . No GO to H4 - H4 CHECK FOR AXLE PINION FLANGE RUNOUT
- Check for axle pinion flange runout.
Are the runout correct?
Yes Inspect the vehicle for any other symptoms related to the driveshaft. No Carry out a runout check and repair as necessary. REFER to: Driveshaft Runout and Balancing . - H5 CHECK THE DRIVESHAFT FOR DAMAGE, MISSING WEIGHTS OR UNDERCOATING
- Check the driveshaft for damage, missing weights or undercoating.
- Check the driveshaft balance.
Was a system fault found '
Yes REFER to: Driveshaft Runout and Balancing . No GO to H6 - H6 INSPECT THE DRIVESHAFT CV (CONSTANT VELOCITY) JOINTS AND/OR U-JOINT FOR WEAR OR DAMAGE
- Inspect the driveshaft CV joints and/or U-joint for wear or damage.
Was wear or damage found?
Yes Install a new driveshaft as necessary. REFER to: Rear Driveshaft . REFER to: Front Driveshaft . No GO to H7 - H7 CHECK FOR DRIVESHAFT RUNOUT
- Check for driveshaft runout.
Are the runout correct?
Yes Inspect the vehicle for any other symptoms related to the driveshaft. No Carry out a runout check. REFER to: Driveshaft Runout and Balancing . - H8 CHECK DRIVELINE ANGLES
- Check driveline angles.
Are the driveline angles incorrect?
Yes Repair as necessary. REFER to: Driveshaft Angle Measurement . No Inspect the vehicle for any other symptoms related to the driveshaft.