TSB 667406 — GMC Service bulletin
667406 is a service bulletin on file with NHTSA for the GMC Yukon, 1992–1994 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. TRANSFER CASE HOPS OUT OF 4-HIGH, OR NO DRIVE IN 2 OR 4-HIGH RANGES AND/OR GRINDING NOISE (INSTALL MAINSHAFT/RANGE HUB KIT)
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years 667406 names
Every document filed under 667406
| Document ID | Filed | Type |
|---|---|---|
| 667406 | December 1, 1996 | Service bulletin |
What 667406 covers
Transmission & drivetrain — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB 667406?
667406 is a service bulletin filed with NHTSA by GMC, covering the GMC Yukon across the 1992–1994 model years. NHTSA's summary reads: TRANSFER CASE HOPS OUT OF 4-HIGH, OR NO DRIVE IN 2 OR 4-HIGH RANGES AND/OR GRINDING NOISE (INSTALL MAINSHAFT/RANGE HUB KIT)
Which vehicles does 667406 cover?
NHTSA's file names GMC Yukon (1992–1994). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB 667406 a recall, and is the repair free?
No. 667406 is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of 667406?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under 667406, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under 667406. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.