3.25 rearends 9 speed Trans Converted to 13 speed. Want to upgrade

If it was me pulling a cow bus I'd want my truck tires the same as my wagon tires so my wagon is sitting level when Iam aired up & rolling
Thats just me though

 

Was it Cummins shop or a authorized Cummins dealer like a Pete or Kenworth or freightliner shop? Usually those shops won't uprate past what the driveline is rated for not matter what cpl the engine is. Liability reasons of course. Without knowing your cpl it's hard to say for sure what you already have but there's some really great aftermarket programmer guys that can get you what you want or close to it. Engine cpl is what tells you what your limit is.

 

Braking performance is best when all drums spin at the same speed. Also.

 

Was gonna say the samething. IF you change out to the higher end might mess that Emission system up as well.

 

Well that's a new one....

 

I'd love to hear the logic behind that?!?