Chevrolet K Series 1998 — technical service bulletin
Bulletin 867402 · NHTSA communication 603827 · issued Sep 1, 1998
Technical service bulletin
communication type
Power Train
component
1998
model years
3
vehicle entries
Official summary
Comments about a moan type noise when the vehicle is operated in the auto 4wd position and is driven in deep sand, deep snow, or deep mud. *yc
Vehicles covered
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.