Installing A Roadmaster Anti-Sway Bar On A 2021 GMC Sierra 2500

Updated 06/14/2021 | Published 06/05/2021

Question:

There are no factory welded nuts in the truck frame to accept the supplied mounting bolts for the frame brackets. The holes on the inside of the frame are about an inch in diameter and the supplied bolts are not long enough even if the holes were the correct size on both sides of the frame to put a nut on. The truck is: 2021 GMC 2500 4x4 diesel crew cab

asked by: Dan W

Expert Reply:

The Roadmaster Rear Anti-Sway Bar Item # RM25FR is not a custom fit for your 2021 GMC Sierra 2500 and will require you to drill holes into the frame during install. The bolt you should be using to attach the brackets to the frame are the M12 x 1.75 x 90 mm BOLT CLASS 10.9 YELLOW ZINC, which are #12 on the parts list in the instruction manual and the are the six larger bolts that you see in the picture of the # RM25FR.

expert reply by: Kevin C