Cadillac Escalade 1998–2000 — technical service bulletin
Bulletin 990421004 · NHTSA communication 607694 · issued Aug 1, 1999
Technical service bulletin
communication type
Power Train
component
1998–2000
model years
14
vehicle entries
Official summary
Some pickups and full-size utility models with an automatic transfer case may exhibit a bump / clunk upon acceleration. *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.