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Awd locking up on turns
1999 Ford Expedition

Awd locking up on turns

(1999 Ford Expedition)
everytime i try to make any sharp turns the front wheels lock into 4 wheel drive and it takes lots of driving before it disingages ! how can i disconect the awd ?
3 answers & 5 comments
Popular Answer
on March 20, 2011
Ron, I'm thinking this vehicle has the A4WD system, where it's potentially "all wheel drive" at any moment. This means that the axle shafts are always "locked" in, and all wheel drive operates as demanded by wheel slippage.

Unfortunately, it appears that there is a transfer case issue with your vehicle, and you cannot disconnect it, as AWD is just the normal drivetrain function of your vehicle.

Things to remember about your A4WD/4WD High/4WD Low system - and to everyone reading:

1) Please remember that 4x4 systems like this especially are extremely sensitive to tire size and wear. Outside diameter of the tire as it sits on your vehicle at any given time must be identical at all four wheels. If there is a variance - either by mismatched tire brands, mismatched tire models, mismatched tire size, mismatched tire wear or mismatched inflation pressure, you will cause wind up in your driveline that cannot be resolved without wheel slippage. This causes force and stress on your driveline and eventually component wear and damage. My experience with the AWD systems on Ford vehicles especially backs this fact up.

2) Maintenance is critical. A Ford engineer in Michigan once told me that you should religiously change your transfer case fluid every 30,000 miles. No questions asked. Cheap insurance.
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on March 20, 2011
Thank you Dave.
Ron here
on March 20, 2011
Hey Ron, do you sleep? Haha...
Since I am out of work I am up at odd hours sometimes. I am supposed to interview for a service manager position this Wednesday. So hope my odd hours change. What the heck are you up at 02:16 PST.???? LOL...This is Ron. I am back up early to watch the NASCAR race. Then I have to put my wife's right headlight actuator motor back on after tearing down yesterday and then installing a metal gear in it, found out that had to let the urethane cure for 24 hours after gluing cover back on so have to reassemble after the race so she gets off my back. It is a 2000 Trans Am. I hate working on that car...lol...
Post your email... I may be able to help on the job side... provided you are bay area? - Dave
on March 20, 2011
I used to live in Paradise, Ca. but now live in Junction City, Oregon. Like I said, have hopefully an interview on Wednesday. To tell you the truth, it is soooo tight around here and lately the wife just ain't gettin' it as far as saving money when I am on unemployment, she is 11 years younger, that if something doesn't break soon I will be moving somewhere, likely by myself, and starting over somewhere. I truly thank you for the offer and may call it in one of these days soon. My email is either raiderron122452@hotmail.com or raiderron1952@hotmail.com. I spent a lot of years in K.C. but moved here in 97 to get away from heat and humidity. I did spend alot of time in Frisco when in the service during the Viet Nam war, spent some time at Hunters Point shipyard when stationed on the aircraft carrier U.S.S. Kitty Hawk. Anyways, there is the email and thanks.
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on March 20, 2011
Ron, I'm thinking this vehicle has the A4WD system, where it's potentially "all wheel drive" at any moment. This means that the axle shafts are always "locked" in, and all wheel drive operates as demanded by wheel slippage.

Unfortunately, it appears that there is a transfer case issue with your vehicle, and you cannot disconnect it, as AWD is just the normal drivetrain function of your vehicle.

Things to remember about your A4WD/4WD High/4WD Low system - and to everyone reading:

1) Please remember that 4x4 systems like this especially are extremely sensitive to tire size and wear. Outside diameter of the tire as it sits on your vehicle at any given time must be identical at all four wheels. If there is a variance - either by mismatched tire brands, mismatched tire models, mismatched tire size, mismatched tire wear or mismatched inflation pressure, you will cause wind up in your driveline that cannot be resolved without wheel slippage. This causes force and stress on your driveline and eventually component wear and damage. My experience with the AWD systems on Ford vehicles especially backs this fact up.

2) Maintenance is critical. A Ford engineer in Michigan once told me that you should religiously change your transfer case fluid every 30,000 miles. No questions asked. Cheap insurance.
Sign in to reply
on March 20, 2011
Thank you Dave.
Ron here
on March 20, 2011
Hey Ron, do you sleep? Haha...
Since I am out of work I am up at odd hours sometimes. I am supposed to interview for a service manager position this Wednesday. So hope my odd hours change. What the heck are you up at 02:16 PST.???? LOL...This is Ron. I am back up early to watch the NASCAR race. Then I have to put my wife's right headlight actuator motor back on after tearing down yesterday and then installing a metal gear in it, found out that had to let the urethane cure for 24 hours after gluing cover back on so have to reassemble after the race so she gets off my back. It is a 2000 Trans Am. I hate working on that car...lol...
Post your email... I may be able to help on the job side... provided you are bay area? - Dave
on March 20, 2011
I used to live in Paradise, Ca. but now live in Junction City, Oregon. Like I said, have hopefully an interview on Wednesday. To tell you the truth, it is soooo tight around here and lately the wife just ain't gettin' it as far as saving money when I am on unemployment, she is 11 years younger, that if something doesn't break soon I will be moving somewhere, likely by myself, and starting over somewhere. I truly thank you for the offer and may call it in one of these days soon. My email is either raiderron122452@hotmail.com or raiderron1952@hotmail.com. I spent a lot of years in K.C. but moved here in 97 to get away from heat and humidity. I did spend alot of time in Frisco when in the service during the Viet Nam war, spent some time at Hunters Point shipyard when stationed on the aircraft carrier U.S.S. Kitty Hawk. Anyways, there is the email and thanks.
on March 19, 2011
I suspect contamination at auto locking hubs. Can get gummed up at the outer flanges when has been too long between bearing repack. Can disassemble and clean, repack bearings and use lighter white lithium grease at the outer auto lock area.
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on June 08, 2018
There's a plug underneath by the transmission I happen to have he same issue with my 99 ford expedition I finally jyst uhh plugged the 4wd motor and it's been disengaged so I hope that helps you... When you need to use the 4wd just plug it back together and you'll have 4wd again...
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