2013–2014 Mack Chu, 2013–2014 Mack Granite (gu), 2013–2014 Mack Leu and 2 other models Recall: Pro-torque nut may not have been installed correctly, which may result in…
NHTSA campaign 13V492000 · Power Train · filed Oct 17, 2013 · verified Jul 30, 2026
The defect
Mack Trucks is recalling certain model year 2013-2014 CHU, CXU, GU, LEU, and MRU vehicles manufactured with pro-torque axle spindle nuts from August 28, 2012, through August 16, 2013. The pro-torque nut may not have been installed correctly, which may result in a loosening of the nut.
The risk
If the nut comes loose, the hub assembly may separate from the vehicle, increasing the risk of a crash.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
Mack Trucks will notify owners, and dealers will inspect and repair the vehicles, as necessary, free of charge. The recall began on November 12, 2013. Mack's recall number is SC0371. Owners may contact Mack Trucks at 1-336-393-2000.
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
Affected vehicles
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Other campaigns involving Mack vehicles
Source: NHTSA recall database, campaign 13V492000 (manufacturer number SC0371). Data last verified Jul 30, 2026.