| Subject: | Boom Noise Or Vibration (Rotate/Reinstall Front Propeller Shaft To Axle) | 
| Models: | 2003 Chevrolet Express 1500/2500 Series AWD Vans | 
| 2003 GMC Savana 1500/2500 Series AWD Vans | 
Some customers may comment on a boom noise or a vibration.
The front propeller shaft may not be seated in the pinion flange.
Rotate the propeller shaft and inspect the U-joint bearing cap for proper installation to the pinion flange.
If installed improperly, there will be a slight gap between the pinion flange and the U-joint bearing cap.
Tighten
Tighten the bolts to 45 N·m (33 lb ft).
For vehicles repaired under warranty , use:
Labor Operation  | Description  | Labor Time  | 
|---|---|---|
*F0015  | Propeller Shaft - Alignment  | 0.2 hr  | 
Add  | To properly install front propeller shaft  | 0.2 hr  | 
*This is a unique labor operation number for use only with this bulletin. The number will not be published in the Labor Time Guide.  | ||