Question about 1993 Chevrolet Suburban

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I have a 93 sub with 4 wheel drive. front drive shaft truns all

I have a 93 sub with 4 wheel drive. With transfercase in 2wheel , if I jack up either front tire ans spind the tire the fron drive shaft turns, should it?

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Yes the front wheels will spin the front shaft but the shaft is not engaged until 4 wheel drive is engaged.


Btw, I’m available to help over the phone in case u need at

Posted on Jan 05, 2010


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I have a 2004 F150 heritage 4 wheel drive that is not going into 4 wheel drive that does not engage all the time. it has a shifter and auto hubs. light on dash shows it is engaged.

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The transfer case will not shift into 4 wheel hi or low 4 wheel drive auto with elect shift

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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.

With the engine running ( and wheel chocked, parking brake on ) have someone shift into 4WD, and watch the shift motor to see if it operates
It is on the front axle, looks like this

If the disconnect motor does not shift, you can check the vacuum on the lines with a vacuum gauge. Blue line is 4WD operation, pink line is 2WD operation.
The vacuum solenoids are on the firewall, and look like this

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This is assuming you have checked the fuses for the transfercase shift motor, and the vacuum solenoids.

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This one is a common problem lever on floor becomes stuck and won't let you disengage it. Have to Spray linkage with WD-40 or some kind of penetrating spray under truck where the linkage comes out of the floorand goes to the transfercase.

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