1999 xlt 5.4L 4WD conversion to 2WD?

[Anitomical]

I’ve been wondering if the 4WD version had some way to convert it to 2WD temporarily because well the gas prices are kicking my butt so yeah

 

[GlennSullivan]

The front wheels should be freewheeling on the hubs when moving and the front prop shafts, differential, driveshaft and transfer case should not be turning. If that is not the case, figure out what is wrong and correct it.

if none of the above are turning, then not much you can do from a driveline perspective. IMHO it does not make financial sense to acquire all the necessary parts from a 2WD Expy, removing all 4WD components and installing 2WD front suspension components.

Perhaps focus on engine tune and efficiency to improve mileage.

 

[Yupster Dog]

The front wheels should be freewheeling on the hubs when moving and the front prop shafts, differential, driveshaft and transfer case should not be turning.

It all turns, all the time. The hubs are bolted to differential axle. No locking device.

I’ve been wondering if the 4WD version had some way to convert it to 2WD temporarily because well the gas prices are kicking my butt so yeah

Everything on the front spins even if you took out front drive shaft. These 1st gen's have no hub disengage.
What kind of MPG you getting?
Welcome to the forum

 

[GlennSullivan]

It all turns, all the time. The hubs are bolted to differential axle. No locking device.

Everything on the front spins even if you took out front drive shaft. These 1st gen's have no hub disengage.
What kind of MPG you getting?
Welcome to the forum

Huh, noone makes an automatic or manual locking kit for the first gen trucks?

 

[Anitomical]

From what I know it’s always putting power to the front wheels too, and I don’t want to get rid of the 4WD I just wanted to know if you could get it into 2WD
And I get about 8-9mpg

 

[juan214]

From what I know it’s always putting power to the front wheels too, and I don’t want to get rid of the 4WD I just wanted to know if you could get it into 2WD
And I get about 8-9mpg

Brown wire mod possibly

 

[Anitomical]

Brown wire mod possibly

What do you mean?

 

[juan214]

What do you mean?

Brown Wire Mod: How To

Ok guys, I searched and could not find anything as far as a write-up for our Expy's relating to the "Brown Wire Mod" that was anything other than "cut the brown wire near the t-case shift motor". I wanted to retain the A4WD feature so I set out to make it work. The purpose of this mod is to...

www.expeditionforum.com

I pulled the fuse during the warmer months and reinstalled during snowy freezing months.

Did the same until I could do FRONT driveshaft u-joints and boot replacements. Then again due to Tcase chain slap.

 

[Anitomical]

Brown Wire Mod: How To

Ok guys, I searched and could not find anything as far as a write-up for our Expy's relating to the "Brown Wire Mod" that was anything other than "cut the brown wire near the t-case shift motor". I wanted to retain the A4WD feature so I set out to make it work. The purpose of this mod is to...

www.expeditionforum.com

I pulled the fuse during the warmer months and reinstalled during snowy freezing months.

Did the same until I could do driveshaft u-joints and boot replacements. Then again due to Tcase chain slap.

Oh boy this seems like a fun project

 

[Bruce Mitchell]

8-9 MPG seems a little low. What kind of driving do you do? When did you last change all the filters? Tires/tire pressure good? All those little details can add up. I do mostly highway driving (55-70MPH) and get 16 MPG. Just my 2-cents. Good Luck!

 

[Anitomical]

I have it set to what’s on the inner door, and also kinda slow driving cause I live out in the country

 

[RonPut]

Maybe purchase the 4x4 selector switch out of a 97-98 Expeditions. Those can be switched to 2WD. Also works on later ones. Or remove the fuse.
That’s what I did on my ol 99 when the chain transfer case chain started slipping during acceleration.

Also MPG should be much higher. Driving my 98 5.4 4x4 EB I get between 15-18mpg

 

[jtoth32377toth]

I drive a 1999 exp 4.6 4x4. The brown wire mod (brown wire goes from under the driver's seat to the electronic clutch in the transfer case.) I cut the wire under the seat you have to pull back the carpet and will see it going out the floor under the driver's seat to the transfer case. I cut the wire and ran an extended wire in series back next to the selector's 4x4 switch. There I mounted a toggle switch. I run the switch open until I want 4x4, when I close the switch I have auto 4x4 again or high or low 4x4. based on the selector switch location. The best mod I did. Good luck. Easy peasy.