90 Chevy Silverado 4/wheel drive not working - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-23-2009, 04:55 PM
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90 Chevy Silverado 4/wheel drive not working

My shop truck was in 4 wheel drive and now it isn't. 90 Chevy Silverado. V8 Automatic 350. Isn't there an electric switch on the transfer case or is it the front axle? THe fuse keeps blowing that says 4wd, but I think it's just this switch thing. When It fisrt stopped working the fuse was not blown. It's like it just quit working. Worked fine for years. Any way to check this?

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Old 01-23-2009, 04:57 PM
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I don't know if you will get answers for this in the interior forum..
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Old 01-23-2009, 05:29 PM
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Moving on to proper forum..

Sam
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I have tried most all of it and now do what is known to work..
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Old 01-23-2009, 07:03 PM
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Quote:
Originally Posted by RAYFIN
My shop truck was in 4 wheel drive and now it isn't. 90 Chevy Silverado. V8 Automatic 350. Isn't there an electric switch on the transfer case or is it the front axle? THe fuse keeps blowing that says 4wd, but I think it's just this switch thing. When It fisrt stopped working the fuse was not blown. It's like it just quit working. Worked fine for years. Any way to check this?

My buddy has an '88 GMC that had the connector on the backside of the front diff. come unplugged. The light stayed on, but it was stuck in 2wd. Plugged it in, worked just fine. After removing a small mountain of snow from the area of course....


In a while, Chet.
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Old 01-24-2009, 06:47 AM
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There is a switch on the t-case and an actuator on the front diff. When mine went out it popped the fuse too. GM has an upgrade kit that lets you use the new style actuator. I highly reccomend it.
Shane
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Old 01-24-2009, 09:41 AM
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It also depends on which one your truck has as to what went wrong with it.
There is the well known bad thermal actuator (TLA or Thermal Linear Actuator) , and the electronic actuator.

Just a ballpark figure (you might be able to find it priced vastly different) My catalog shows the TLA actuator for $110, the electronic actuator for $170, and a 4X4 posi-lok for $300.

There may also be other manufacturers of a cable operated interaxle locking kit for a vastly different price. but at least the cable reacts NOW, and has less of a chance of failing.
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Old 01-25-2009, 08:24 PM
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Thanks so much guys. That helps alot. I couldn't find ***** in my manual.
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Old 12-02-2010, 10:47 PM
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It was the switch thing on the front axle. (actuator)
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