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Mike S.
Mike S., ASE Certified Technician
Category: Ford
Satisfied Customers: 6778
Experience:  ASE Certified Master Technician
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My expedition the front wheels jump sometimes like its in

Customer Question

My expedition the front wheels jump sometimes like its in 4wd
Submitted: 1 year ago.
Category: Ford
Expert:  Mike S. replied 1 year ago.

At what speeds and if turning right or left, forward or reverse?

Have you recently replaced any front end suspension or steering parts, tires or wheels?

Customer: replied 1 year ago.
Everything new axles bushings tires
Customer: replied 1 year ago.
It's like it jumps in and out of 4wd
Expert:  Mike S. replied 1 year ago.

Did you replace all of these parts trying to fix this problem or did this problem just occur after replacing these parts?

Expert:  Mike S. replied 1 year ago.

was the front end aligned after replacing those parts?

Customer: replied 1 year ago.
It did it before and after and yes it was realigned
Customer: replied 1 year ago.
It happens at all speeds and turning right and left
Expert:  Mike S. replied 1 year ago.

is it possible to remove the front drive shaft and test drive it and see if the problem goes away or not?

Customer: replied 1 year ago.
I'll give it a try and let you know
Expert:  Mike S. replied 1 year ago.

ok

Customer: replied 1 year ago.
No problems with front driveshaft out
Expert:  Mike S. replied 1 year ago.

That must mean it's a problem with the 4wd or transfer case.

Let me see if there are any tsb's or troubleshooting tips for that.

Customer: replied 1 year ago.
Thank you
Expert:  Mike S. replied 1 year ago.

I did find one and it does sound like what you are experiencing,

Expert:  Mike S. replied 1 year ago.

It says, "shudder on acceleration/deceleration, binding in slow speed . turns or noise from the front driveline and/or transfer case."

Expert:  Mike S. replied 1 year ago.

They are saying it might be the circumference of the tires being not the same.

Expert:  Mike S. replied 1 year ago.

Now that I think about it, I don't think this tsb applies because they said this happens while in 4wd/awd and you said you are in 2wd.

Let me search some more.

But that tsb did give me an idea. If and when we do put the drive shaft back on but I am not saying to do it right now, disconnect the wiring to the transfer case like they said in that tsb and see if the problem goes away.

Expert:  Mike S. replied 1 year ago.

This one sounds a little closer,

Expert:  Mike S. replied 1 year ago.

It says, "Some vehicles may exhibit inadvertent 4X4 Hi or Low shift events, 4X4 and/or Low Range indicator flashing or solid or vehicle stuck in 4L after uncommanded shift. This may be caused by the 4X4 shift motor."

Customer: replied 1 year ago.
Where would that be located and how do I fix it.
Expert:  Mike S. replied 1 year ago.

Tsb's usually instruct how to test. I read a little of that last tsb and it does instruct how to test. Let me see if I can find a diagram of the location of that shift motor and a wiring diagram and how to remove it if need be.

Expert:  Mike S. replied 1 year ago.

here is how to remove it,

Expert:  Mike S. replied 1 year ago.

The shift motor sense plate, an integral part of the electric shift motor, is used to inform the GEM what mode the transfer case is actually in.

The digital transmission range (DTR) sensor, located on the left side of the transmission, informs the GEM of the transmission gear position.

The 4x4 shift motor relay is a module containing two relays which, under the control of the GEM, shift the transfer case shift motor between the three 4WD modes.

Expert:  Mike S. replied 1 year ago.

just an explanation of what it is.

Expert:  Mike S. replied 1 year ago.

First of all, you have to look and see if you have the old style or new style shift motor.

Expert:  Mike S. replied 1 year ago.

If it has a blue cover, than replace it. If it's a gray cover, follow with that tsb.

Expert:  Mike S. replied 1 year ago.

You never answered one of my first questions, at what speed does this happen?

Customer: replied 1 year ago.
Usually it happens when I apply the brakes real hard then it feels like something slams forward in the drivetrain everything seems tight though. Also when I first start the truck and back up with the wheels turned. Then it starts jumping and banging
Expert:  Mike S. replied 1 year ago.

I need an actual speed.

Expert:  Mike S. replied 1 year ago.

It sounds though you are describing what is on page 1, UNCOMMANDED SHIFT TO 4L

Expert:  Mike S. replied 1 year ago.

Front end binding or hopping while turning.

Bind feel in drivetrain when backing up and/or turning

Expert:  Mike S. replied 1 year ago.

Start at b. Check mode switch circuits 682

Expert:  Mike S. replied 1 year ago.

Did you go through that pdf?

Customer: replied 1 year ago.
I did waiting for the new shift motor
Expert:  Mike S. replied 1 year ago.

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