2021 GMC Yukon AT4FACTORY OEM SERVICE PROCEDURE

Fastener Specifications

GM5539598Courtesy of GENERAL MOTORS COMPANY
Front Seat Belts

Callout Component Name [Component Quantity] Single Use Fastener/Component Thread Locking Adhesive Required Specification Procedure
Metric (English)
1 Front Seat Belt Adjust Bolt [2x] - Yes 45 N.m (33 lb ft) Front Seat Belt Guide Adjuster Replacement 
2 Front Seat Belt Buckle Bolt - Yes 45 N.m (33 lb ft) Front Seat Belt Buckle Replacement 
3 Front Seat Belt Opening Bezel Bolt [2x] - - 1.1 N.m (10 lb in) Front Seat Belt Opening Bezel Replacement (Center Seat) 
4 Front Seat Belt Retractor Bolt - - 45 N.m (33 lb ft) Front Seat Center Belt Retractor Replacement 
GM5613801Courtesy of GENERAL MOTORS COMPANY
Second Row Seat Belts

Callout Component Name Single Use Fastener/Component Thread Locking Adhesive Required Specification Procedure
Metric (English)
1 Rear Seat Belt Anchor Plate Bolt - - 45 N.m (33 lb ft) Rear Seat Belt Retractor Replacement 
2 Rear Seat Belt Guide Bolt - - 45 N.m (33 lb ft) Rear Seat Belt Retractor Replacement 
3 Rear Seat Belt Retractor Bolt - - 45 N.m (33 lb ft) Rear Seat Belt Retractor Replacement 
4 Rear Center Seat Belt Buckle Bolt (60 Percent Seat) - - 75 N.m (55 lb ft) Rear Seat Center Belt Retractor Replacement 
5 Rear Seat Belt Buckle Bolt - - 45 N.m (33 lb ft) Rear Seat Belt Buckle Replacement (40 Percent, Bucket with UH5) , or Rear Seat Belt Buckle Replacement (40 Percent, Bench Center Buckle without UH5) , or Rear Seat Belt Buckle Replacement (Bench Center Buckle with UH5) , or Rear Seat Belt Buckle Replacement (60 Percent with UH5) , or Rear Seat Belt Buckle Replacement (Bucket without UH5) , or Rear Seat Belt Buckle Replacement (60 Percent without UH5) 
6 Rear Seat Center Belt Anchor Plate Bolt (60 Percent Seat) - - 45 N.m (33 lb ft) Rear Seat Belt Buckle Replacement (40 Percent, Bucket with UH5) , or Rear Seat Belt Buckle Replacement (40 Percent, Bench Center Buckle without UH5) , or Rear Seat Belt Buckle Replacement (Bench Center Buckle with UH5) , or Rear Seat Belt Buckle Replacement (60 Percent with UH5) , or Rear Seat Belt Buckle Replacement (Bucket without UH5) , or Rear Seat Belt Buckle Replacement (60 Percent without UH5) 
GM5539600Courtesy of GENERAL MOTORS COMPANY
Third Row Seat Belts

Callout Component Name [Component Quantity] Single Use Fastener/Component Thread Locking Adhesive Required Specification Procedure
Metric (English)
1 3rd Row Center Seat Belt Retractor Bolt [2x] - Yes 45 N.m (33 lb ft) 3rd Row Center Seat Belt Retractor Replacement (SWB) , or 3rd Row Center Seat Belt Retractor Replacement (LWB) 
2 3rd Row Seat Belt Anchor Bolt - - 45 N.m (33 lb ft) 3rd Row Seat Belt Retractor Replacement 
3 3rd Row Seat Belt Guide Bolt - - 45 N.m (33 lb ft) 3rd Row Seat Belt Retractor Replacement 
4 3rd Row Seat Belt Retractor Bolt - - 45 N.m (33 lb ft) 3rd Row Seat Belt Retractor Replacement 
5 3rd Row Seat Nut [2x] - - 45 N.m (33 lb ft) 3rd Row Seat Belt Buckle Replacement (60 Percent and Mini Buckle) , or 3rd Row Seat Belt Buckle Replacement (40 Percent and Center Buckle) 
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.