4:10 with the current 17" wheels will really eat some gas won't it? Anyone have any idea what kind of miledge that would give?

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98' STX, Silver,
Mods: 3" PVC intake
Future Mods: Electric Fan (better gas miledge)
3" PVC Ram Air
3-4" Lower (need kit cheap)
Maybe one day supercharger
84' Mustang SVO 158k(rebuilding)
87' Suzuki LT500 Quadzilla

 

I think the one after 4.10 for the Ford is 4.56. But, won't that kill me on the highway and with MPG. Also, I think bumping up that much requires some extensive rear end work so you don't tear the truck apart.

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1998 F150 Nascar Edition(removed the decals)
4.6L V8 4x2 Reg Cab Short Bed
K&N Generation II FIPK
Borla Split Rear CatBack Exhaust
Stull Billett Grill
KC Hilites 150watt daylighters behind the grill
PIAA 1700 foglights in bumper
APC Clear corner lenses
Pirelli Scorpion ST (265/70/16)on factory Nascar Black Mag Wheels
Bug deflector
Side window deflectors
Snapless Tonneau Cover
Duraliner Bedliner
Alpine Head unit
Alpine Amp
Boston Acoustics Speakers
Bazooka Tube behind passenger seat

Future Mods:
Superchip
Torque Converter
JBA or Gibson Headers
Edelbrock Throttle Body
Traction Bars
IAS or Reflex Shocks
Anti-sway bars
Granatelli Mass Air Flow Sensor
Vortech Supercharger
Underdrive Pulley Set
Go Rhino Nerf bars
Crystal Eyes Projector headlamps
APC Euro Taillights

 

jwrape:
I'm in exactly the same situation. OD is all but useless except on the flat. I don't think there's anything "wrong" with our trucks, we simply should have had the 3.73 gears from the factory.

The cost of going from 3.55 to 3.73 is prohibitive unless you can do the swap yourself. I've read in a number of off-road magazines that gas mileage can IMPROVE with a shorter gear. In our case we may find that we can keep the OD on thereby lowering rpm and using less fuel.

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'00 5.4L AUTO 4X4 F-150 Lariat
'98 4.0L 5spd Jeep Wrangler Sport
'02 F-350 PSD CC DRW 6SPD 4X4 Lariat (order this year)
www.hawthorn-engineering.com

 

I can do the swap with my fathers help.
I think it would be a definate benefit, especially if I go to a larger diameter wheel.

------------------
98' STX, Silver,
Mods: 3" PVC intake
Future Mods: Electric Fan (better gas miledge)
3" PVC Ram Air
3-4" Lower (need kit cheap)
Maybe one day supercharger
84' Mustang SVO 158k(rebuilding)
87' Suzuki LT500 Quadzilla

 

gah:

The truck is bone stock.

The 7700 series came with 3.73 (for those who don't know what a 7700 series is -- the F-250 LD became the F-150 7700 in 2000 -- my suspicion is that it was to bolster the sales figures for the F-150).



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Y2K™ Jim - N8JG@Hotmail.com

Toreador Red, Keyless XLT SC SB 5.4L E4x4 4wDisc/ABS, 3.73LS, Skid, HD 7700# Towing, LT-245's on Chrome, Tube-Steps, Captain's, 6CD, Tonneau, named: "Nick"

 

I think that Y2K has hit the nail on the head. The 3.73 gears are very well matched to the 5.4L and the improvement is probably greater than the small percentage change would indicate. If I keep my truck and don't buy an F-350 this year, I will definitely be doing a 4.10 swap.

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'00 5.4L AUTO 4X4 F-150 Lariat
'98 4.0L 5spd Jeep Wrangler Sport
'02 F-350 PSD CC DRW 6SPD 4X4 Lariat (order this year)
www.hawthorn-engineering.com

 

Just a thought here but Jwrape, what if you put a K&N Filter on the front end. I had problems with the truck shifting out of OD going up small hills and as soon as I put the K&N FIPK on, the shifting quit. The truck now breaths easier which allows it to make more power. This was my first mod. which I have had for a long time and I have hauled a load of wood before and after putting it on. Made a world of difference on my truck with just the filter. Might be cheaper and less time consuming then changing your rear end. Just a thought though.

Have Fun & Keep on Truckin'
Dean

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1994 F-150 XLT Supercab, Long Box, 302 EFI, 3.55 LS, Superchip, K&N FIPK, Bosch Platinum +4 Spark Plugs, Automatic, Single Catalytic converter, followed by a Raven Z-55 muffler and finished off with chrome tips (2 1/2" to 3"), Royal Blue in and out, Captain Chairs. Chrome Rims 15x8's, BFGoodrich Radial T/A's 107S 275/60R15 (Summer), OEM Aluminum Rims 15x8's, Michelin LTX M/S 108S (Winter), Lightly Tinted, Soft Tonneau Cover, Ford Receiver Hitch Cover & Lock, J&J Enterprises Stainless Steel AirDam with KC driving lights, Lund Supersteps, Lighted Grab Bars, VTech Slotted Taillight Covers, Alpine CDM-7829 Head Unit, PPI 4800 Amplifier, Kicker 10" Solo Baric Sub with Custom Box and Kicker Impulse 6.5 Mid & Tweets.

 

I have 4.6 with 3.08 gears and a 5 speed and have no problem climbing anything or beating most you just pick the gear you need and gas milage is 19-21.5 on the highway?. As for OD isn't that the gear that is used for just mosieing along and not trying to pull a load. If you are pulling a heavy load i would not even think of using O/D

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1997 F-150 XLT 4.6 shortbed REGULAR CAB, FLARESIDE CLEARCOAT GREEN 5-SPEED. WESTIN NERF BARS, POWER EVERYTHING,BUG SHIELD, EX-TANG SOFT COVER, BED LINER(FORD).

Better 1/2 : 92 Red T-Bird V-6 3.8. maint.free 113,500 miles