whats the disadvatage of 3:55 gears. I was told go for the 3:92s on 4 wheel drive

 

Nothing really. 3.92 comes with LSD

 

3.55's come with LSD too, as an option starting in 2011. you'll lose acceleration with the taller gears and theoretically gain better highway fuel economy. i have the 3.55's and they're more than adequate. my truck has no problem getting up and moving. my fuel economy is as ****ty as everyone else.

 

I have owned a few Ram's with the 3.55 and they were fine, but only had a single leg. I am not aware about the prior post that mentioned the 3.55 LSD is now an option. The other Ram's I owned had the 3.92 LSD and were good to. I do not think there is really any disadvantage. The 3.55's I had went through the snow good w/FWD. My present Ram has 3.92's and goes through snow just the same. I quess the only benefit is you tach less on the hwy. w/3.55 ratio

 

I went from 3.55 gears to 3.92 in my truck and only lost about 1 mpg. I can still hit 17-18 mpg highway with it on road trips and it pulls my 7x14 enclosed trailer so much better now than it did before I swapped gears.

 

I went from the 3.55 to 4.10 & and LSD. Night and day difference in the acceleration, but I only lost about 1, maybe 2 MPG. Like Porter mentioned, the MPG is still just as crappy as before.