I am really looking forward to getting a 3" body lift and going from 35's to 37's and 20" rims. I really dont want to hurt my gas milage any more, does anyone who has made this transformation know how badly it affected if any at all.

P.S I have the 4.6 not 5.4.

 

I did the same thing 35's to 37's on my 4.6L and the gas millage stayed the same did not really change at all.

 

it will hurt it a little. you may not be able to notice it, but it will be there. The 37's are going to be hard on that 4.6, id recommend a re-gear before stepping up to 37's.

 

^yup I am goin to 4.56's with POSI

 

Why not 4.88s?

 

I have 4.56's and I think I'm set on upgrading to 37's so I'm stuck with the gears I have, but if your regearing for 37's go with 4.88's

 

How would my highway be? Plus I guess 4.88 would be good cuz I am using my truck to tow my race car with also. So I need all the ***** I can get.

 

well if i regear to 4.88's wont that do some real nice damage on my gas milage? or will that help? and how much should that run me gears+labor?

 

If I'm not mistaken 4.88's are best for performance, towing and city driving, 4.56's are best for highway

They should run between 1200-1500 depending on the shop you go to.

 

got 37s with 4.88s love them lot better on gas

 

The life of your transmission will be severely shortened if you do not re-gear. The clutch will burn up very quickly. I have a manual transmission and when I went to 35" tires before changing the gears, I had to to ride the clutch ALOT more than stock. I could only imagine how hard it would be with 37" tires.

It cost me close to 1200 to regear both the front and rear differentials. I got my parts from nationaldrivetrain.com.

 

I LOVE my 4.88s .. I drive about 50% city and 50% highway. I try to go the speed limit on the highway to save some gas but it's not too bad. I'm running about 2100 rpms at 70 mph with 37s. The 4.88s help so much offroad though, it's insane. If you like to play around crawling, it will help a lot!

PS: If you don't have a limited slip, get one when you do the gears!!

 

Thumper i have the 4.6 keeping in mind that do you think that i would be staying at around the same on the high way 2100 at 70mph with 4.88's??? Right now I am on 35's and i am Running about 1980to2020 at about 73mph!

Thanks Thump.Ps your truck looks killer

 

yeah i also want to upgrade to 37's and 3 inch body. what kinda gas mileage do you get with 37's after regearing?? i got the 5.4 triton fx4 with the 26 or 27 gallon tank i believe. anybody running 37's on a 04-07 supercab fx-4?



6" fabtech
skyjacker 1.5"aal in rear
35" nitto
20"kmc monsters
flowmaster 40 series true dual
nascar side exit exhaust tips powder coated black
oem hd headlights and tail lights
fx2 grill
k&n kit
hypertech
stealth turn signal bulbs in front
custom emblem what ever it is i will be working on some new sh it! keep an eye out!

 

Prematuref150 were did you get your headlights or the black housing for them?