Calling all mechanics!!!

[gregintenn]

I have an 02 Silverado. Last winter, one morning it wouldn't engage into four wheel drive. This is to mean the transfer case isn't turning the front drive shaft.

 

There are no warning lights on in the dash. I've replaced the transfer case shift motor, and the switch in the dash with the buttons to select 2wd, 4hi, 4low, etc. Same thing.

 

I've read about a transfer case control module. I have to buy another $150 part to see if that's it. I had no prior problems, leaks, noise, etc. in the transfer case

 

. Got any suggestions as to my next move? :wall:

[DT INC.]

When you push the button do you hear any noise that sounds like it is trying to engage?

[Dustbuster]

Shifter motor component on top of front axle?

[gregintenn]

When you push the button do you hear any noise that sounds like it is trying to engage?

Yes.

[gregintenn]

Shifter motor component on top of front axle?

No. The front drive shaft isn't turning. If it doesn't turn, the front axle isn't going to get power no matter what.

[bersaguy]

May be a stupid question but have you checked the fuses. Should have a 25 amp fuse that powers those units.....just a suggestion...... :up:

[gregintenn]

May be a stupid question but have you checked the fuses. Should have a 25 amp fuse that powers those units.....just a suggestion...... :up:

Not stupid at all. I did check them. All good.

[bersaguy]

I had 4X4's most of my life and the last one was an S-10 Blazer. Biggest piece of junk I ever owned. 4 Wheel always had issues because it was all vacuum operated and had to stay after vacuum leaks all the time. Give me an old K10 from 1970's or a Dodge Ramcharger 4x4 from back then with the NP 205 transfer cases and I would be totally happy. Only had an issue one time with a NP box and it was a stretched chain. I replaced the chain and drove the Ramcharger another 70,000 miles many of them off road.............jmho 

[BrasilNuts]

To go kinda with what bersaguy was saying... I have a '02 Blazer ZR2 and about 5 years ago the four wheel drive stopped working. I have a friend that is a Chevy mechanic, we checked everything and it turned out to be the rubber vacuum chamber under the battery. If memory, serves you push the button, it sends a signal, the rubber chamber expands/contracts, and pulls a rod that engages the 4x4.

Hope this helps. Edited March 27, 2016 by BrasilNuts

[gregintenn]

To go kinda with what bersaguy was saying... I have a '02 Blazer ZR2 and about 5 years ago the four wheel drive stopped working. I have a friend that is a Chevy mechanic, we checked everything and it turned out to be the rubber vacuum chamber under the battery. If memory, serves you push the button, it sends a signal, the rubber chamber expands/contracts, and pulls a rod that engages the 4x4.

Hope this helps.

This one's all electronic. No vacuum used to my knowledge. Someone else has told me that it has a clutch assembly inside the transfer case, and it probably needs replacing. Makes sense.

[Tncobra]

Get out the multimeter Edited March 27, 2016 by Tncobra

[glowdotGlock]

That's why I like my manual transfer case engagement in the floor. Hope you figure it out soon.