GMC 1989 Light Duty Truck Repair Manual page 307

C. M easure w ith A xle S h a ft F orced O u tb o a rd
1. S h a ft
5. Tube
9. C a rrie r C o n n e c to r
23. O u tp u t S h a ft
29. C a rrie r C ase
Figure 3 7 — M easuring to C alcu late Shim Size
K TRUCK FRONT AXLE 4C4-19
F-5877