hey, i have a pair of 3:55 geared axles sitting under my ramcharger that are out of my previous w250, i recently bought a 90 w250 and it has 4:10's with 38" tires, would the 3:55 geared axles be worth swapping into the 90 w250? will i gain more in fuel milage then having my 4:10's?

 

Yes, but I don't know how much. Lame-o answer, I know...

 

i have a 1991.5 w250 5 speed and i get 23-24 mpg with 3.55 i have a 1996 2500 4x4 with 4.10and i get 18 now that is p pumped so its not that same truck as the 91 and its also a auto but at 65 iin running 2000 rpm where with 355 im running less dont have a tach so cant give real numbers

 

doesn't make much difference, but aren't they 354s? Mark

 

38s and 3.55s, you will be using first gear a lot more, it won't be so much like a granny gear with that set up. Might actually get decent mileage around 80-85, thats about where mine starts dropping off rapidly with 33s and 3.55s.

 

I've got 35's with the 3.55's and it's pretty good top end but 4.11's would work really well as far as pulling off the line.

 

With the 3.54's I have in old RAE I cruise in 5th on the freeway at about 1700 rpm @ 65mph. But I'm running the stock size tires, 235/85/16's.

 

Isn't 3.54's and 38" tires a little hard on the driveline? Seems like the trans would be lugging and working harder.

 

Yea, and you probably would rarely get in 5th gear.