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Discussion Boards > Active Subjects > Messages as Posted > Chevy Pickup Trucks Forum

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 11-21-2002, 07:33 Post: 45250
George in VT



Join Date: Jul 2003
Location: Monkton, VT
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 12
  88 GMC Sierra 4wd problem

I have an 88 Sierra with a 5.7 litre V8. Having a problem with it coming out of 4wd after about 20 minutes of use. When I start it, seems to be fine, but after warming up, it comes out of 4wd and will not go back in. My machanic installed a new solinoid that engages the front axle when shifted into 4wd, but that only seems to do it a little quicker and nothing else. Hoping that someone else has had this problem, as the snow is already here in VT and need 4wd to plow my 1/2 mile driveway up the side of a mountain. Thanks for any help.






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 11-25-2002, 08:28 Post: 45360
Art White



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Join Date: Jan 2000
Location: Waterville New York
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 6854
  88 GMC Sierra 4wd problem

Geeorge, I don't have much experience here but it sounds if it's not electrical that it must be in the transmission but I don't believe so. I have heard that some of the after market switches on the axle don't work to well if at all so you might want to check to see if it was a GM part you had installed.






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 11-27-2002, 15:13 Post: 45470
Jeff Earthwerks Unlimited



Join Date: Jul 2003
Location: Flat Rock, Michigan --- Home of the Flat Rock Speedway -- 32 miles northeast of Toledo, Ohio 10 miles southwest of Detroit
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 69
  88 GMC Sierra 4wd problem

I believe you have the electro-mechanical actuator which consists of a disc shaped diaphram connected to a shifter arm that engages the 4 wd. The way it works is when 12 power is applied the bimetallic diaphram expands and pushes the shifter rod; when is turned off it cools and contracts. These are known for disengaging when driving through a cold water puddle or cold packed snow covering the axle--it would be like turning it off. There are many replacement systems for this which use a push pull cable like a choke cable. They about $150 for decent one. The nice thing is, you control it from the dashboard and it will stay engaged even with the power off. Try 4x4 Parts Wholesalers in Cal. or any 4x4 offroad shop in your locale. Or just search online.






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