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My 4x4 dont work its a 95 dodge ram 2500 cummins

The transfer case shifts and the front drive line moves but the front tires don't move the last owner took it to the shop they said it would be almost a 2000 dollar repair any ideas what it might be

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  • chrissnyder_
    chrissnyder_ Nov 30, 2012

    it uses vacuum to shift i have no idea what the the shop was going to repair on the 4x4 and i'm able to do my own repairs

  • Anonymous Nov 30, 2012

    on my 92 dakota & yours may be the same,my old S10 also. On the right side of the front axle is a small vacuum can with two hoses. Engine vacuum goes to the vacuum switch next to the transfer shifter & then to the axle vacuum con or servo. Really simply & all you do is remove the hoses & use a hand vacuum pump while turning the right front wheel & it will lock in the right side axle. The front only drives the right wheel & basically only the right rear. So much for 4 wheel drive.

  • Anonymous Nov 30, 2012

    Maybe should have said left fron & right rear as the front diff is pointing to the rear ,so reverse rotation

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1 Answer

Nothing costs $2000 to repair,IF you fix your
original unit or parts

I don't have any info, as this is just a chat room & we are
at home & use ,as you do

If the Transfer Case works well & sounds good in 2wd
& shifts nice & turns the front shaft your in fairly good shape

Are we talking some type of complete overhaul of the front
diff or what,or just a vacuum actuator issue?

This is all manual shift as I recall from the 1990's so no
electrical involved correct?

Learn all you can & let me know if you can find out what the
owner was told. May be a front diff,hub or axle issue

Can you do all your own repairs at home,if not your in trouble

Posted on Nov 30, 2012

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csmock132
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SOURCE: 2000 dodge ram 2500 4x4 cummins 5.9L engine. Auto

Sounds like a bad governor solenoid/

Posted on Jul 25, 2010

  • 128 Answers

SOURCE: 1989 toyota 4x4 pickup 3.0l truck will shift in

you probably have a problem with the differential in the front it might be no good it looks like a rear end pull the cover off and check the gears

Posted on Aug 21, 2010

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I have got a 2000 dodge ram 2500 cummins 4x4 that the Temperature Gage doesn't move and the Heater doesn't get very warm. I have changed the Thermostate, with no change......


Have you checked the block pressure.There was a problem with the impellor coming loose on the water pump which causes low block pressure and reduces circulation.You should also check the vent line to the rad and make sure the jiggle pin in there is ok it sounds like the system may be air locking

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I can not get power to the motor to engage my front axle on my 4x4.


Power as in 12 V DC ? if yes, you are not in the correct area, the front axle is locked in and out of 4x4 mode with vacuum.

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.

- 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_200.jpg
Item #10 in this diagram
sscullys_10.gif
-- 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.
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_199.jpg

- If the front drive shaft turns:
For ESOF system
-- Check the fuses for the transfer case, engine compartment fuse panel, 17 & Cab fuse panel fuses 13 and 23 ( verify with owners manual, 97-97 & 99-03 MY can be slightly different on some items ).
-- Try hitting the transfer case with a dead blow hammer ( do not use a metal hammer, it can damage the transfer case ) to see if the transfer case shift motor is hung up .
-- Check the transfer case connector, to make sure the connector pins are clean and making good contact.
For MSOF systems
-- Check that the shift linkage on the transfer case is moving when the lever is moved from 2W to 4H and 4L.

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The 4x4 is controlled by vacuum. There is a vacuum switch on the top of your transfer case that control the vacuum to the front axle shift motor. The shift motor has 2 ports, when vacuum is applied to one side the shift motor moves the fork one way and when vacuum is applied to the other side, the fork moves the other way.

The first thing I would do is verify the hoses at the transmission cross member are hooked up. Then I would remove the 4 bolts from the shift motor and remove the motor and start the engine and shift in and out of 4x4 waiting 10 seconds before each shift and see if the fork moves.

If it doesn't you will need to check the vacuum connector on top of the transfer case and make sure it is fully attached, if it is, you will need to remove the vacuum connector and check to see if you have engine vacuum on one port(around 15" vacuum). The ports are as follows - one port goes to engine vacuum, one port goes to a vent and the other two go to your shift motor. The hoses that go to the shift motor are bad for getting plugged, so you should use compressed air and see if they are clear.

If everything checks out, you will have to remove the switch on the transfer case and operate it by hand while the engine is running and see if the plunger moves in and out. Sometimes the plungers will stick in!

A vacuum gauge and pump are needed to check the motor and switch. If you don't have one, you might need to borrow one and put a vacuum on the shift motor and see if it holds vacuum. Once you put a vacuum on the shift motor the fork should move and then should pump down and hold a vacuum, if it doesn't hold vacuum, you will need a shift motor.

This is alot of info, but there are many possibilities for this not working and you will have to check all these things to diagnose this.

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Transfer case wont engage


shift into 4wd and move truck a couple of feet.
if light is still off, park truck block the wheels set the park brake jack right front wheel and try to hand spin the wheel if wheel doesn't turn 4x4 is functioning properly but there is a wiring problem use an ohmmeter to check the 4x4 switch wiring fuse and bulb
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attempt to hand spin the front driveshft if the driveshaft will spin the transfer case is not engaged check the transfer case shift linkage, problem is in linkage or transfer case internals
if the driveshaft will not spin the transfer case is engaged properly
with trnsmission in neutral or park start engine measure vacuum on the two vac lines at front axle shift motor . one line should have approx 20" vacuum. other line should have none
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