Chevrolet C Series (light) 1989–1996 — technical service bulletin
Bulletin 667406 · NHTSA communication 50569 · issued Dec 1, 1996
Technical service bulletin
communication type
Power Train
component
1989–1996
model years
23
vehicle entries
Official summary
Transfer case hops out of 4-high, or no drive in 2 or 4-high ranges and/or grinding noise (install mainshaft/range hub kit) *tw
Vehicles covered
- 1990 Chevrolet C Series (light)
- 1991 Chevrolet C Series (light)
- 1992 Chevrolet C Series (light)
- 1993 Chevrolet C Series (light)
- 1994 Chevrolet C Series (light)
- 1995 Chevrolet C Series (light)
- 1996 Chevrolet C Series (light)
- 1989 GMC K Series
- 1990 GMC K Series
- 1991 GMC K Series
- 1992 GMC K Series
- 1993 GMC K Series
- 1994 GMC K Series
- 1995 GMC K Series
- 1996 GMC K Series
- 1989 GMC Yukon
- 1990 GMC Yukon
- 1991 GMC Yukon
- 1992 GMC Yukon
- 1993 GMC Yukon
- 1994 GMC Yukon
- 1995 GMC Yukon
- 1996 GMC Yukon
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.