I tow a trailer and if your not worried about a race the 3.55 are fine. The hemi still likes to rev so My guess is towing you will probably be in the same gear just higher RPM's. Correct me if I am wrong guys.. I tow a 4000LB ultra lite 26ft camper and honestly, I totally forget its back there. I have the 3.55. Now, if I was BUYING again i would get the 92 like I had in my 2003, it just had more snort, I cant break the tires loose on the 3.55's on dry pavement but, thats not what I want. When I go down the freeway at 70ish I get around 22 on the EVIC.

 

I have an 09 with the 3.92 and I get 16-17 on the highway. Never ever got close to 20. But our speed limit is 70 mph which usually means my cruise is set at about 79.

 

Generally, the lower ratio (numerically higher) will raise the Max. Payload and Max. Trailer weights.

 

As far as the ride itself, 3.55 will feel more comfortable excelerating and cruising. The 3.92's are not as comfortable cruising as you will see when using your foot and not your cruise control...they tend to jerk your passengers around a bit, lol! I am always adjusting my foot and getting complaints from my passengers and it's just a habit, I'm not doing it on purpose.

 

I had a brochure from a toy hauler company at one time that had a very extensive list of trailer towing capacities for the major trucks and SUVs. The data was compiled by the American Travel Trailer Assoc. or something like that, anyway.

Ratings for '05 Ram 1500s with identical equipment (engine, tow package, etc.) showed about a 1000# difference in capacity going from 3.55 (the lowest available at the time) to 4.10s. Since I have 4.56s, I would have loved to see that rating, but for some reason, they only listed up to 4.10s for every make/model.


I had a rather long conversation with a Ram engineer at a truck show not long ago and asked why in the hell a truck, utilizing a transmission that essentially has TWO over-drives would be paired with 3.21 gears (or even 3.55s for that matter) and he had a ONE WORD answer - EMISSIONS.
It's not even a matter of fuel economy, it boils down to lower rpms = lower emission output...