I have a 97 F150 EXT cab 4X4 that I recently installed larger wheels and tires.I found a program at 4LO.com that calculated what I needed to get my truck back to stock and it said I needed 3.88's.I have looked around and all I could find was either 3.73's or 4.10's and would like some suggestions on which ones to run.I went from 255/75/16 on 16X7 to 285/70/16 on 16X8's.

 

If you want better fuel mileage, go with the 3.73s if you want better acceleration go with the 4.10s
I installed 4.10s in my truck(see signature) and I love them.This is how the truck should be from Ford. Also, this mod cost me less than 1.5 mpg overall

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99 F 150 4x4.ORP,S/B 4.6 4.10 gears, Gibson 3" cat back. K&N filter. Superchip

 

Dawgwild,
I have to agree w/ jarrettruelz88, Go w/ the 4.10's I had OEM 3.55 gears and 235/75/16's and went to 4.10's and 265/75/16 I also needed the 3.88 gears. Don't do the job half *ss, You will not be dissappointed w/ the 4.10's!!! W/ my setup I have the option to go 3 tire sizes larger (295/57/16) this would bring me almost back to stock performance 4.098 ratio. The gears will run about $180.00, and approx $68.00 for the install kit, plus tax.
A local gear shop installed them for $250.00.
Good luck

F&B's

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98 F-150 XLT, SC, SWB, 2WD, Pac. Grn., 4.2L auto, 4.10 gears w/ LS, Tow Pkg., BFG AT's 265/75/16, K&N air filter, Dynomax Super Turbo muffler, Superchip, Edelbrock shocks, Hellwig rear sway bar, 3" body lift, signal mirrors, ...tons of cosmetic products

 

So anyone have any good estimates on swapping 4.10s in 4x4 truck?

The one shop I called said something about the IFS up front being time consuming and said $1,300-1,500 for 4.10/4.56's installed . * OOOUCHH*

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Y2K F150 4x4
4.2 5 speed, with K&N
Leer camper shell,bedrug,
Ranchhand Brushguard w/lights. Tint/alarm
VHF/HF radio and CB