Chevrolet Avalanche 2004 — technical service bulletin
Bulletin 04019 · NHTSA communication 10006811 · issued Mar 1, 2004
Technical service bulletin
communication type
Power Train
component
2004
model years
7
vehicle entries
Official summary
4l80e / 4l85e transmission may have a condition in which the transmission overdrive gear set may fail due to inadequate lubrication as a result of a transmission casting change. Customer satisfaction program bulletin. Also to include 2004 chevrolet and gmc w3500, w4500, and isuzu npr, npr-hd. *tt
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.