I want to purchase a new 2008 quadcab 4x4 automatic and I can't decide whether to get 3.73 or 4.10's. I will be towing not over 13,000lbs. I would really like to have the 3.73's. but in order to run in 6th gear it would only be turning about 1600 rpm's at 65. I am wondering if it will have enough torque and hp to tow at 1600 rpm's on level ground and a slight grade? Has anyone ever been in this situation? I guess I want the best of both worlds, towing and fuel economy.

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96 Dodge 2500 reg. cab SLT 4X4 diesel 3.55's automatic 12Valve 86,000 miles. Best truck I have ever owned.

 

Well then when your towing keep it in 5th when empty use 6th

 

Ditto what he said.You have enough gearing spread in the lower gears to pull the 3.73 easily,and just dont let it run into 6th,use 6th when empty.If your mountain towing most of the miles,and very heavy Id say the 4.10s are the best.

 

I'd get the 3.73s. My 5.9 has less grunt than the 6.7 does and I do fine with 3.73s,grossing about 19K combined.

If you were at the max (GCWR) I might consider the 4.10s.