rear end
Administrator
Joined: Jul 2007
Posts: 24,686
Likes: 21
From: South Georgia/East Florida
RE: rear end
Go with the 4.56's for either towing or larger than stock tires. All this crap about higher rpm's & lower gas mileage is exaggerated. My RPM's at a given speed are up about 400 from when I had stock 3.92's. Mileage ranges from about 1mpg better in town to about 1 mpg worse on the interstate.
For any truck with over about 30k miles on it, go with the master install kit.
For any truck with over about 30k miles on it, go with the master install kit.
Veteran
Joined: Sep 2004
Posts: 442
Likes: 0
From: Phoenix Arizona
RE: rear end
ORIGINAL: supermotojoe
I think if you had two trucks side by side one with 17" like stock and 20" you would see the smaller tires offer more get up and go and probably better mpg. The biggers tires must pay a price on mpg. Anyone out there with 17"? What kind of milage are you getting. theroetically a set of 4:66 gear sets would = having 17" tires (my math my be off a bit). Again this is all based on the factory not changing gear sets when they put 20" tires on, I may be wrong. Either way it's gonna go faster when i'm done with it.
I think if you had two trucks side by side one with 17" like stock and 20" you would see the smaller tires offer more get up and go and probably better mpg. The biggers tires must pay a price on mpg. Anyone out there with 17"? What kind of milage are you getting. theroetically a set of 4:66 gear sets would = having 17" tires (my math my be off a bit). Again this is all based on the factory not changing gear sets when they put 20" tires on, I may be wrong. Either way it's gonna go faster when i'm done with it.
http://www.rocky-road.com/calculator.html
This is a link to a gear/tire/ calculator.
4.10's with 35" tires will put you very close to stock rpm's while 4.56's will give you a bit more performance than a stock set up.
