I don"t tow all that often. Mostly during the camping season. Maybe have to rethink the 4.56's. Probably go with the 4.10's

 

Well if you do them post on here or dodge talk and see if someone knows a good installer in your area. I know for me 4.56's on my daily driver going 65-70 mph wouldn't be good for my gas mileage.

 

wow.. i guess I should shut up, and likely will after this post... but..

with a 3.7? you, absolutely, beyond doubt, unequivocally WOULD save gas with 4.56's.. you are the stereotypical poster boy for a heavy truck with underpowered power plant.. you can either get that torque to the terra through shear brawn, which the hemi's are capable of doing, or you can get it to the ground with leverage (gears).

you're overall average mileage would likely increase as much as 3MPG.. more if you do more city driving that highway, less if you run primarily highway- but leaning back toward more if you run highway with decently altering grade..

there is a science to gears.. there is a science to engine load.. I have no clue why people don't wrap their brains around the fact that there is a HUGE relationship with those two critters, and are quick to point out charts showing RPM's at speed (which, admittedly, is a good measure when the engine IS NOT LOADED, but absolutely irrelevant if it IS) as the sole measure of an engines efficiency.. but oh well, you guys have fun..

 

Drew I had 3.55's and was able to get 18 mpg most of the time w/ a mix of city/highway maybe 70/30, and w/ more highway driving I could get 20-21 mpg. I switched to 4.10's b/c I was having the carrier swapped and was told the labor would be essentially the same. After the 4.10's the best I do is 18-19.5 mpg mostly highway miles, so I can only conclude the 4.10's hurt my gas mileage. Sure they would help if I was towing a lot or had bigger than stock tires, but I don't really tow and have no plans for bigger tires.