im putting 31's on my truck and just got 3.55 posi for the back.... how will this whole setup be in my v6 with 3.55 gears? need good gas mileage i get about 25 now

 

Considering stock tires are 29", you will lose a bit of mileage.

 

25! You must have had 3.08s to begin with...I'm with glc though, you will lose a good bit of mileage. I get 19-20 on 29" tires with 3.55...

 

im putting 31s on it a guy said if i put the 3.55 gears in it that it would drop but if i put bigger tires on it, it balances things out and i would get about the same mileage

 

As much as a posi setup runs, I would not have paid that much just to settle for 3.55's especially since your going to be lifting.

 

I'm still in astonishment at the 25 mpg...:o

 

i payed 100 bucks for a BRAND new set of 3.55 and the posi... haha i know people... if it was more i wouldnt have bought it.

 

yea have 3.08's right now haha thats why its soo good haha and i heard if you go bigger with tires on 3.55's your mileage would go back to normal... because things even out... so ill see wat happens when i put these 31's on it, if not i can always throw my 3.08's in the posi and do it like that but we will see the guy i talked to worked at ford and said go 31's with the 3.55's and my mileage will be back to almost normal

 

plus the fact that my motor is being cleaned and rebuilt from the ground up as we speak.. that will help to, i should have a brand new motor when im done

 

No way will you get the mileage back - if you got 25 with 3.08's and 29's you will get maybe 20 with 3.55's and 31's.

 

im gunna throw it in and try it, if its ****ty on gas and i cant deal with it ill throw my 3.08's back in the carrier and throw it back in the truck