Question about 2002 Chevrolet Silverado 1500
When I try to put my truck into 4 wheel lo, high, or auto the front end locks up. The rear wheels work, but can't go anywhere due to the front end. I have checked the transfer case and it is not out of oil, but it smells burnt. The truck is driving like something is in a bind, but don't know what. I had a hard time getting it back into 2 wheel, and you can hear a clank in the front end. Some is just slack, but when you drive it after awhile there is a thump intermittantly in the front end. Clueless...
Most if all problems with the chevy 4x4 at the beginning of problems are the electronics the switches they put crap in the truck and wonder why so many problems to anyone whom sees a problem at the start should first and i mean first clean all the contacts on 4x4 switches the two on the dash and then one on transfer case the one inside the dash sits where people sit drinks like coffee then it runs down dash and onto the switch inside dash you need to take it out clean it good i have fixed more 4x4 problems with doing this first you will not hear this from the dealerships they will tell you you need to replace them when all it is that they need a good cleaning i also take the switch on dash apart and clean contacts then the lights work please try contact cleaner first and more times over it will fix your problems
Posted on Feb 15, 2013
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Posted on Jan 02, 2017
SOURCE: 4 wheel drive not working
Check the vacume line. It's what locks in the front end. Under the battery box theres a vac servo with a cable, the cable locks the front axels.
Posted on Dec 28, 2008
It does not seem that sufficient diagnosis was done. No, you cant give a specific diagnosis like that without tearing unit down. It's likely that they told you the most common failure and left it at that. Likely there is a problem with your unit...I think this becomes more of a trust issue than a mechanical one. A second opinion from an independent reputable shop may help but either way, you need to have it fixed. In not using it much, it makes me wonder how it got worn.
Posted on Mar 19, 2009
you need to check to see if the front drive shaft is turning when the wheels are on the ground, if the front drive shaft is turning then the problem is in the front differential. i will give you a brief description of how the front differential works when you put the truck into 4 wheel drive there is an electric motor on the transfer case that engages the front drive shaft also when the transfer case shifts into 4 wheel drive it turns on a vacuum switch which sends vacuum to a actuator that is mounted under the battery box the vacuum actuator then pulls on a shift cable that is hooked up to a shift collier inside the front axle assembly the collier then slides and locks the right front axle to the front differential which in turn allows the front wheels to then be turned by the power plant.you probley have a bad vacuum actuator or vacuum switch or on rare occasions we see the shift collier go bad inside the front axle assembly.
now that takes care of the front end but if when the truck is on the ground and in 4 wheel drive and in gear and the front drive shaft is not turning then you need to have the transfer case checked to see if the electric motor is engaging the front drive shaft. it may only be moving the shift frok only part way and not fully engaging the drive.
Posted on Feb 07, 2011
The issue is usually loaded gears. The secret is to try circles, one way and then the other. This preload is why 4x4 is supposed to be used on loose surfaces....The gears will disengauge after they unload.
Posted on Feb 23, 2011
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