Driveshaft Indexing Procedure

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. Refer to Section 00-02. 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 index of driveshaft to transmission and axle companion flange.

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.

5. If re-indexing at axle is unsuccessful, disconnect the driveshaft, re-index 180 degrees at transmission 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 Universal joints in each direction of rotation. If a Universal joint feels stiff or has a "lumpy", "gritty" feel in any direction, replace Universal joints.

6. If re-indexing 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 re-installed, if additional Loctite is applied. New and used bolts must be tightened to 95-129 Nm (70-95 lb-ft).