96 Silverado wont lock into 4 wheel drive - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-19-2008, 07:41 PM
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96 Silverado wont lock into 4 wheel drive

OK, so I have a 1996 Chevy Silverado Z71- 5.7 litre auto, Im not sure what Tranny. Push button 4 wheel drive independant front. Now, to the problem- I have three buttons 2 wheel 4 hi and 4 lo. when I pressed either of the fours nothing would happen- they would just blink.I replaced a blown fuse, dont know what to but after that when I press the buttons now it stil just blinks but when I try to go back to two wheel I here a pretty loud clunk, this would happen sometimes before the fuse but now it happens every time. The four wheel wont engage. also the tranny is having trouble shifting and when i punck it it inda just stalls, at like 3/4's throttle it gets going my uncle said adjust the cables shifter and throttle and what not Im havnt done that before. so If anyone could try to help me work this out I would apreiceate it very much Ill check the site at least every day so Ill respond back to any questions that may help someone provide proper guidence thanks> can wait to here from ya!!!!!!

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Old 12-19-2008, 08:05 PM
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The electronic 4x4 setup uses failure-prone electric servos and possibly a couple vacuum operated pots. (I think they quit using the vacuum pots by 96 but not sure.)

Whenever someone posts a problem with a GM 4x4, chances are its one of those electric servos that has failed.
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Old 12-19-2008, 08:06 PM
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Chevy's use a modual to control the 4x4.. they are common to fail... with Fords, it's more prominant that the shift motors fail
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Old 12-20-2008, 06:58 PM
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where on my truck would I find these moduls/ servos? how hard are they to replace and how mych? how do I single this problem out. where do I begin with the tsting/trouble shooting. I appreiceate the help
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Old 12-20-2008, 08:30 PM
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This should be what it came with.

But I would upgrade to the second design, Much less problematic.But you will have to get an adapter and a wiring harness(goes from the Tcase to the actuator located on the front differential) from gm

Shane
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Old 12-20-2008, 08:36 PM
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It's called a actuator motor, it screws in the side of your from diff. You will see a plug on the motor,make sure your getting 12 volt's to the actuator when you push your dash switch. If your getting power to the plug then the actuator motor is bad.

Last edited by prostreet6t9; 12-20-2008 at 08:42 PM.
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Old 12-20-2008, 09:00 PM
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re:96 silverado wont lock in........

is the transfer case sending torque to the front differential?
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Old 12-23-2008, 07:08 PM
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RE: is the transfer case getting tourqe

I dont know if its getting tourqer. Today tried to go to the store- when i started the truck, the four wheel low lit on the switch was bllinking like when I tried to turn it on. then as i backed out i tried to turn it off and now none of them will light up or anything my truck wont move. Not in Drive reverse 123 and it grinds when i put it in park. Thanks again for all the help.
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Old 12-23-2008, 07:22 PM
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Quote:
Originally Posted by hotrodsather
I dont know if its getting tourqer. Today tried to go to the store- when i started the truck, the four wheel low lit on the switch was bllinking like when I tried to turn it on. then as i backed out i tried to turn it off and now none of them will light up or anything my truck wont move. Not in Drive reverse 123 and it grinds when i put it in park. Thanks again for all the help.
Sounds like the T/C is stuck in N. I would look at 2 things, You will see a electric motor on the back of your T/C, Make sure you have 12 volts to that motor. If you have no voltage then I would suspect the switch in the dash.
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