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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Jason Morris

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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.

Lone99star

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jason_77a19afa8d604dee

Posted on Jan 05, 2010

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1 Answer

96 explorer disengages 4wh low but does not engage 2wheel


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1 Answer

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1 Answer

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I would suspect the vacuum disconnect motor or the vacuum solenoids for the disconnect motor ( or the vacuum lines ), but best to confirm
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
85ec248.jpg

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
50a3265.jpg

This is the block diagram for the ESOF vacuum operation of the disconnect motor.
c01c924.jpg

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

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1 Answer

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If Jeep is equip with push button 4x4 try this.
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If Jeep is equip with lever on floor.
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.

(Floor lever, Its tuff to get it to release I know I went through the same problem on my truck I had push it into 2wheel by using my leg.)

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