Under bed hitch mounting system

[Rafael20192500hd]

I have a 2019 sierra 2500hd Denali I ordered the OE hitch mounting system pt# 84164445

can anybody tell me the size holes I need to drill out for my bed and what are the torque specs for bolting it to the frame I think all 5 holes are the same size but I could be wrong 

[newdude]

Going off the plastic hole covers GM uses, the center is a 4 inch diameter cover, the 4 others are 3.5".

 

All of the bolts for the hitch are 177ft.lbs.  Box mount bolts are 63ft.lbs.  

Edited September 6, 2024 by newdude

[hankmertz]

On 9/6/2024 at 9:26 PM, newdude said:

Going off the plastic hole covers GM uses, the center is a 4 inch diameter cover, the 4 others are 3.5".

 

All of the bolts for the hitch are 177ft.lbs.  Box mount bolts are 63ft.lbs.

Slope Game

You are very welcome Newdude!

Edited December 23, 2024 by hankmertz