I have a 2006 4 door short boxPower Wagon 2500 with a hemi, 6 speed manual, and 4:56 gears. I was wanting to know if it could maintian 75MPH going up a pass with 37's, (Vail pass incase anyone was wondering).
Thanks

 

Yeah you shouldn't have a problem. My 98 rcsb 4x45.2 liter ram on 33's with 3.50's in the rear end can maintain that speed up large passes so I assume your truck with lower gears and MUCH more power could as well. I need to regear to 4.11's bad.

If you are towing you may have a harder time though. Just normal truck though, you could do it.