Need help with gear selection

[03boost]

I have an 03 f-250 6.0 with the complete edge system intake exhaust with 6 inch lift with 37 inch tires and i can get a GREAT deal on a set of 4.56 gears would this benefit or hurt me i really need all the help i can get thanks alot

[TANK'S 250]

get them....don't think....just get.....your tranny will thank you....your fuel mileage will thank you.

[03boost]

Thanks alot

[jamstoyz]

i wouldnt do 4.56 i would recomend stickin with 4.30's cause they are a ford gear. i heard alot of bad about the 4.56. i have a 4.30 in mine and like it alot but i have to keep it under 65mph cause of mileage. at 60 mph im at 2000 rpm.

[03boost]

but even with the much bigger tires you still dont think it will be good

[TANK'S 250]

I have 4.56's, no problems here.

I recommend you do 4.56's,...it will help with the "rotational mass" of the 37" tires....which will increase your fuel mileage, be easier on your tranny, and give you your low end power back.

[03boost]

What kind of speed can you get up to?

[TANK'S 250]

When you re-gear to 4.56's...it will bring you almost perfectly back to stock rpm's

stock is 3.73 and a 30.5" tire.....or 3.73 and 31" tire....so stock rpms are around 2660
If you put in 4.56's with 37" tires...your rpms will be around 2692...which is almost exactly the same as stock.

remember ,...you need a little more "UMPHFFF",...because of the larger, heavier tires.







do you tow?

.

[03boost]

yeah i do sled pulls on occasions

[big black excursion]

i went up to the 4.30 gears in my excursion from 3.73. it was just fine. 70 mph was about 2300 rpms. i think the 4.56's might be a little too much. but that is my opinion.