FLY 4 FUN wrote:
Dodge has online tables that will list all of the possible variables others have listed above...and give you the max ratings. Even 20" tires vs 17 can impact your ratings. On a personal note I had a 2004 4x2 quad cab with a hemi and 3:55 gearing and I regret not having a more "towing friendly" gear in there. As mentioned before, having too much truck is rarely an issue so the 3:92 gears will perform slightly better than the 3:55 with all other factors being the same. The only downside is worse mileage, but that's a compromise we face with towing houses down the road.
I'm doing a lot of window shopping online before actually going to lot before test driving. I started out looking for a 3.92 gear. Found very few with the 3.92, mostly 3.55. Why see a truck online I like and go to dealer and find out it don't tow what I would like. So I would use the VIN they post on dealer site and check at the two above links to see gear and towing capacity for that individual VIN. Most had 3.55 very few had the 3.21 and the 3.92.
In going to the link for Towing "Look up my vehicle" I noticed that some VIN's showed 8800 and some 10800#, yet the Build PDF from the other link states 3.55 gear. With that got me thinking maybe I could get a RAM with a 3.55 gear and tow 10800# if the site states it at 10800#.
Side note seems like most pdf file also shows that it come with the engine cooler and transmission cooler.