Chevrolet Silverado 2008 — technical service bulletin
Bulletin 08-04-20-001A · NHTSA communication 10026441 · issued Apr 1, 2008
Technical service bulletin
communication type
Suspension
component
2008
model years
4
vehicle entries
Official summary
Gm: rear axle gear whine noise from hd pickup trucks equipped with 11.50: ring gear and mw7 automatic transmission (diagnose ring and pinion). *pe
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.