op wrote:
How do I figure out what the axle rating is?
The 2500/3500 SRW Dodge/Ram from '03 on up use the AAM 11.5" rear axle which AAM rates it around 10800 ? lbs capacity.
The 3500 DRW used the same 11.5" axle till sometime in the 20teens when Ram upgraded to the AAM 11.8" rear axle.
Dodge/Ram derates it by using lower rated tires...wheels and rear spring packs. So you have around 3800 lbs of reserve capacity before exceeding AAM ratings.
If I was dead set on using a TC that size on a 3500 SRW, I would load it all up then hit the scale to see how much help the trucks OEM tires...wheels...and rear suspension needs to be safe.