Chevrolet Sierra 2001–2004 — technical service bulletin
Bulletin 052103 · NHTSA communication 10003656 · issued May 21, 2003
Technical service bulletin
communication type
Power Train
component
2001–2004
model years
7
vehicle entries
Official summary
Essential tools for servicing the allison transmission. These tools include a four-wheel drive spanner nut wrench, rear bearing puller legs, digital depth micrometer and a rear bearing installer. These tools are required to replace a cracked extension housing on an allison installed in a four-wheel drive pick-up. 2004 sierra included. 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.