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The motor does not turn front drive shaft when engaged but I can turn the shaft by turning the wheeels

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  • Cars & Trucks Master
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Turning the wheels and the shaft turning is normal. unless you lost the differential. You have to check the transfer case. If your's is a manual case, then something inside or the linkage is broke. If it is electrical. then it needs trouble shooting. Could be a switch, wiring, or the motor. Could also be internal.

Posted on Dec 13, 2014

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3 Answers

99 Ford F-150 won't go into 4wheel drive I looked undernieth and front drive shaft is not turning


Someone will have to go under and check the linkage is working when the 4 wheel drive is fully engaged and not just moved to a neutral position.

Dec 04, 2014 | Ford Cars & Trucks

1 Answer

Is there an electric or vacuum switch on a 2001 chevy blazer


There are 2 models here the push button will flash if the system is not engaging or disengaging properly . If front drive shaft is turning. That is with car raised and supported . if front drive axles do not turn then the axle actuator is not engaging axle shaft passenger side. Remove actuator and manually engage shifting collar with a screwdriver still does not turn then inner axle is twisted.

Mar 21, 2014 | 2001 Jeep Grand Cherokee

2 Answers

Got. A 2003 f150 4x4 got problems with 4 wheel drive locking in and stay in drive shaft turning front wheels not


Operationally vacuum shifts the front axle between 2WD and 4WD mode. The GEM ( Generic Electronics Module ) applies ground to the solenoid needed for the mode selected on the switch ( for ESOF ) or when the transfer case shift lever is moved ( MSOF ).The contact plates in the transfer case signal the GEM that the transfer case is engaged, and the Vacuum solenoids need to be activated ( either 2WD to 4WD or 4WD to 2WD ).

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
- If it turns it is a problem with the transfer case.
- If it doesn't it is a front axle engagement problem ( this is what you seem to have, the transfer case is engaged and will drive the front shaft mine was a key on engine off test ).

- If the front drive shaft does not turn :
•With the truck running ( with front wheel back on the ground ), switch from 2WD to 4WD and back again, the vacuum shift motor should move the lever on the front axle.
sscullys_185.jpg
-- If the vacuum shift motor does not move:
1.Check for vacuum on the lines while shifting between modes. Pink vacuum line is 2WD mode, Light Blue vacuum line is 4WD.
2.Check the fuses for the 4WD system and the solenoids.
3.Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
sscullys_187.jpg
4.Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
5.Check the vacuum reservoir box for cracks.
6.Typical solution is the vacuum lines ( to the solenoids or to the vacuum shift motor ) are cracked or the vacuum shift motor has a cracked diaphragm and has water in it.
7.Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.
sscullys_186.jpg

Usually the case is cracked vacuum lines from the solenoids, the next common is a cracked vacuum reservoir box, and 1 time I have seen the mount for the vacuum disconnect motor broken ( motor floating free so it could not push against the axle )
sscullys_188.jpg

Aug 28, 2011 | 2003 Ford F150 Regular Cab

1 Answer

4 wheel drive wont engage on my 97 f150


Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

I would suspect that the front drive shaft will not turn, and the issue is with the vacuum shift for the front axle.

The vacuum disconnect motor is on the front axle ( item #10 in the picture below )
sscullys_4.gif

Close up of the vacuum disconnect motor ( this is in process of being repaired )
sscullys_74.jpg

The vacuum solenoids are mounted on the firewall, and take vacuum from the vacuum reservoir to move the shift motor when the GEM ( Generic Electrical Module ) calls for a mode ( 2WD or 4WD ).
The Pink line will have vacuum on it when in 2WD mode, the Light Blue when in 4WD.
Use a vacuum gauge to verify that the vacuum is on the line when selecting the mode.

Dec 30, 2010 | 1997 Ford F150 Regular Cab

1 Answer

I have a ford f 150,v8 engine and my 4 wheel drive wont work now, can it be just a fuse?


Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

I would suspect that the front drive shaft does not turn, and the issue is with the vacuum lines for the front axle.

You can check the vacuum lines with the engine running, and have a vacuum gauge on the front disconnect motor. Pink line is 2WD operation ( unlocks the front axle ) Light Blue is the 4WD operation ( locks the axle ).

The disconnect motor is on the front axle, item #10 in the picture below
sscullys_2.gif

Picture of it.

Dec 10, 2010 | 1998 Ford F150 Regular Cab

1 Answer

4 wheel drive system not operating, have already repaced drive motor on transfer case, still not working


Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Engine on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

IF the front dive shaft does not turn, check that the vacuum shift motor on the front axle is operating.


Item #10 in the diagram below.
9bcf2eb.gif

The vacuum shift motor is vacuum operated ( name says that, I know ) the pink vacuum line is 2WD operation, the Light Blue vacuum line is 4WD operation.
If the motor does not move, you can check the vacuum lines to the vacuum solenoids on the firewall
7f1140f.jpg

The other is the vacuum reservoir behind the battery
fd65776.jpg

Oct 18, 2010 | 1997 Ford F150 Regular Cab

1 Answer

1995 jeep grand cherokee with a 242 tranfer case. the jeep is in 2 wheeel drive but the front tire are grabbing in tight turns. is it a easy fix to get it out of 4wd or is it not in four wheel drive and a...


The mode fork inside the transfer case has a weak or broken spring. This is allowing the fork to engage the mainshaft, causing it to place it in 4x4 drive. To repair this the transfer case will need to be replaced. To solve this issue temperarly, you can remove the front drive shaft to keep it from locking the front wheels, but you most likely will hear a grinding noise from time to time while driving, and would still need to address the mode fork issue.

Mar 30, 2010 | 1995 Jeep Grand Cherokee

1 Answer

My 2003 F-150 will not engage the 4-wheel drive when the switch is turned on? Two days ago it worked fine and the light does come on?


Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

I am going to guess the drive shaft will not turn, and the problem is the shift disconnect motor on the front axle, or the shift solenoids.
The shift motor looks like this
37bcd6a.jpg

The shift solenoids look like this :
1a11fc1.jpg

You can check the shift solenoids with a vacuum gauge. The blue vacuum line is the 4WD operation, the pink is the 2WD operation. Pull the vacuum line at the shift disconnect motor, and install the vacuum gauge. Shift into 4WD and the vacuum should be on the line, and hold. If not could be the disconnect motor or the vacuum line to the motor.

Could also be the shift motor in the transfer case, but with the 4x4 light on the cluster lighting up, the transfer case should have shifted, the confirm comes from the transfer case to illuminate the 4x4 indicator on the cluster.

Feb 20, 2010 | 2003 Ford F150 Regular Cab

1 Answer

It feels like the four wheel drive kicks in but the front wheeels dont spin


there is a electrical switch for your transfer case is actually engaging then the front axle might not be locking in check ur hubbs... note u get into 4 low and front tires not turning then it would most likely be the lock outs

Dec 25, 2009 | 1998 Chevrolet Tahoe

2 Answers

1998 Chevy S10 front axle will not engage when put into 4 wheel


Normal thing that happens as long as onone (worked) on it, is the vacume hose going to the engage sevevo under the battery box has fell of on either end or is brocken on the way there. Then the once or now leaky battery acid ate up this same servo. then the cable going to the front axel breaks sticks falls off or even someone needing one climbed under your truck while parked somewhere to get one to replace their brokeen one now you don't have one then theaxel engage arm or gearset is damaged

Aug 16, 2009 | 1998 Chevrolet S-10 Pickup

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