1998 Tahoe Push Button 4wd Not working.

Hey guys this is my first post here. Thanks for having me. Now to the problem. I have a 1998 Tahoe with LT trim 5.7 Vortec and My push button 4wd isnt or doesnt seem to engage. The lights dont stay on. I push it to
2w Hi it stays there for about 20 secs then goes off, samething when I push the 4Hi, 4Lo or auto 4wd. I can hear something clicking underneith the dashboard. Also I hear something like the xfer case in the rear but Im not sure if its in 4wd or not. Any help would be great. thanks.
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I had a 98 Blazer and had the same problem only it started with other electric problems such as the headlights working only in daylight. Anyway, it finally got stuck in 4 wheel drive so I brought it in and they had to take the whole dash out to replace somekind of relay. It cost me $800 and I immediatly took it over and traded it in on an 04 Avalanche. By the way at the dealership I was told it still would not go into 4LO. Buy an Avalanche. Best truck I've ever owned so far.

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Sounds like an encoder motor....$$$ Put the truck in some sand or mud and see if the front wheels will spin when you mash it, see if it's actually going into 4x4.
GMC Gremlin

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