ok i would love to have the 4.56 gears on my truck but i have been told by some that they will fit and others that they wont. if they dont fit i guess ill settle for 4.10 but can i really put the 4.56 and just change the diff. cap or do i really gotta change the whole back end????????

 

no the 9.25 axle CAN handle the 4.56's

but whatsize tire are you going to run? if your running just 265's-315's id say just go with 4.10's anything bigger, then i would get the 4.56's

 

i say f*** it. get 5:13 gears haha. you could pull my house (and it aint a tailer home nether)

 

never hear that... or that these axles cant handle 4.56's

 

i think you need a different carrier, or is that the front axle?

 

You're 2wd can take any gear set. The rear 9.25 corporate axle does not need a new carrier. You can get up to 4.88 sized gears

The front axle on a 4x4 is a Dana 44 and it would require a new carrier or a "thick" gear set.

 

I agree.

 

here ya go....this chart really should be stickied....
courtesy of olyelr....

http://www.4lo.com/calc/geartable.htm
keep in mind the final rpms on here are without OD but the recommended gears to be stock or close are still the same.

 

I have 4.10s, and it was nice when I had 265/75/16 tires, then I got the 35s... it is usable, and i do, a lot, but it needs improvement. I would much rather sacrifice some highway RPM for more torque, its like a difference of 250rpm in O/D between 4.10s and 4.56... ill take the 4.56s... accually, with my 35s, i want 4.88s.

 

agreed i run 265/75/16 with 4.10 in the front and rear, and i feel its perfect.