GM Astro/Safari 1985-1996 Repair Guide
See Figure 1
Fig. Fig. 1: Location and description of the drive axle serial number
All Astro and Safari Vans have the drive axle serial number located on the forward side of the right axle tube. The 2 or 3 letter prefix in the serial number identifies the drive axle gear ratio.
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Use Code: TUNEUP20
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