Indexing

The first check to be performed when driveshaft vibration is suspected is re-indexing the driveshaft at both the rear axle and transmission.

A vibration free driveline can result from the driveshaft indexing procedure when minor driveshaft imbalance is cancelled by minor system runouts.

1. Raise vehicle on hoist. Remove rear wheel and tire assemblies and rear drum or rotor assemblies. Place floor stands under suspension arms to support rear of vehicle. Note or mark indexing of driveshaft to transmission and axle companion flange.

Marking Position On Driveshaft Yoke:

2. Mark one hole position on driveshaft yoke at rear of driveshaft with the letter A and the eight circular flange holes (starting with the mating hole with driveshaft position A) from one through eight. Position A-1 is considered the original index position.

3. Disconnect driveshaft, re-index 180 degrees at axle position A-5. Check for vibration at road test speed. If vibration is still present. evaluate positions A3 and A7.

4. If further improvement is desired, evaluate remaining positions that are located between the best of the two previous positions, A-3 and A-7. If vehicle tests satisfactorily at any point during this procedure, do not proceed with any further steps.

NOTE: Check U-joints for binding during first reindexing.

5. If reindexing at axle is unsuccessful, disconnect the driveshaft, re-index 180 degrees at transmission only and connect. Check for vibration at road test speed. If vehicle tests satisfactorily, do not proceed with any further steps.

NOTE: Remove driveshaft from vehicle and manipulate U-joints in each direction of rotation. If a U-joint feels stiff or has a "lumpy", "gritty" feel in any direction, replace U-joints or driveshaft.

6. If reindexing at both axle and transmission is unsuccessful, refer to Driveshaft Balance Diagnosis as outlined.

NOTE: Original equipment driveshaft-to-axle companion flange retaining bolts (N-800594-S100) are Loctite coated and do not require a lockwasher. If these bolts are removed, they may be installed, if additional Loctite is applied. New and used bolts must be tightened to 95-129 Nm (70-95 lb-ft).