How to change F & R Differential fluids

[Hellz]

dont know about 4.56's, i went with 4.88's

on 37 inch tires..

4.10's tranny would always down shift when crusing at or above 70. on hills or even some acceleration, it would downshift. i felt like i was working the driveline more.

with the 4.88's- quick take offs. tranny isnt working as hard. it will still downshift, but it feels more natural..steeper hills or what not.

today after the diff fluid changes i noticed it was very quiet and smooth.
not saying it wasnt before, but it was break in fluid i had in it with just a little over 1k miles on the new gears. everything felt smooth... just only was i can describe it. on the plus side, i gained just over 1 mp from the regear.. so now im at 9.9 mpg.. was at 8.8 on stock gears.

if your running stock 35's, i dont see a reason to regear to 4.56s. i guess there are benefits to quicker take offs, and maybe some extra MPG.. someone else might be able to chime in about it.

If you plan on going bigger tires.. then yes, i wouldnt hesitate and regear.

im thinking of moving up to 38's... i just dont want to do a lift.. well i will do new T keys, but no body lift. I think i can do 38's, but i might still stay at 37's..

If you know anyone selling BFG M/T KM2 37 inch tires, let me know. i have 1 brand new one, just need 3 more..tho, might go with the Toyo's if i cant find a good deal