My son has a 2006 Ram 2500 4wd manual, he is replacing the turbo and as long as he has it down he is thinking about changing gears to get better mileage he currently get between 11 and 12 mpg. What are your thoughts? He would have to change the gears in the rear end and the front differential would he have to do anything with the transfer case? What would be a good ratio he does a little pulling on occasion.

Thanks

 

What gearset is in it now?......Ben

 

3.73

 

That's a good all around ratio for everyday and light towing...My 2003 4WD manual had the same gears, and I thought it was perfect...Suggest he get some taller tires for it instead...I went from whatever the stock 17" was to 245/70R19.5's and got a little better highway mileage...My current 2009 with 4.10's has the same tires, with similar results...Plus the commercial tires far outlast light truck tires, and feel more stable with a load...If it was my truck, I'd leave the gears alone......Ben