Chevrolet Silverado 2500 2008 — technical service bulletin
Bulletin 080420001A · NHTSA communication 10025285 · issued Apr 1, 2008
Technical service bulletin
communication type
Power Train
component
2008
model years
2
vehicle entries
Official summary
Ei08084 - rear axle gear whine noise from heavy duty pickup trucks equipped with 11.50" ring gear and mw7 automatic transmission (diagnose ring and pinion). Built from october 12, 2007 thru october 17, 2007. *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.