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1996 Tahoe appears to be "slipping" into 4 wheel drive when driving. We notice a low pitch grinding sound and have to stop the Tahoe in order for it to go back into 2 wheel drive and at that point hear a "Clunk" sound as it disengages. The indicator light does Not indicate that it is going into 4 wheel when it does this. The problem has progressively gotten worse and will do this often. When we manually unhook the cable from underneath, it no longer does this. What could be causing this?

Answers from the Automotive Experts

Amy Mattinat, Owner and Author at Auto Craftsmen Ltd Dear Cat, Impossible to say what is wrong with your car without having it here at the shop to look over. Sounds like something is loose in the shift linkage. You need a professional technician to diagnose the problem and give you an estimate on what it would cost to fix it. All My Best, Amy Mattinat

Lori Johnson, Owner and Instructor at Ladies Start Your Engines Dear Cat, If you have a switch that puts the vehicle in 4WD it may be that it is faulty. When you talk about disconnecting the cable are you talking about the wire from the switch? If you have a separate shifter for the 4WD then it could be that you need to have this adjusted. If it's going into 4WD on it's own and you have to stop to shift it back, you should have your transmission checked where it connects to the transfer case. I have heard about the shaft's clip breaking off, that holds it in place, which allows it to try and engage or run in 4WD. You need to take it to a certified shop that is good with transmission work to have this diagnosed. Lori Johnson

Suzanne Grego, Technician at City of Philadelphia Fleet Management Cat, I'm not sure what type of cable you're reffering to. If it's an electronic cable, or an electrical connector, the vehicle will need to be scanned for problem codes and you will find out the next step from there. If it's a manual cable you are writing about, I would most likely assume that the cable is either misadjusted or binding. Either way, keep the cable disconnected until you can get the problem corrected. This situation can cause extensive damage if you keep driving it in this state. Suzanne

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