Question about GMC Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: My 2006 GMC Envoy Denali
TRY PUTTING THE TRANSMISSION INTO NEUTRAL, I HAD THE SAME EXACT PROBLEM, UNTIL I CALLED A MECHANIC FRIEND OF MINE. I COULDN'T BELIEVE HOW WELL IT WORKED.....CHECK IT OUT.
Posted on Apr 17, 2009
Low fluid can cause slipping. (depends upon how low) Most manufacturers post "safe" tow speeds. These are generally ignored. (not good). I recommend towing with driveshafts removed and where driveshaft has a "slip yoke" you install a yoke from a scrapyard and wire it to the tailshaft so it stays in place (keeps oil in and dirt out) Although you can't just detach the tow-bar and drive, it eliminates any possibility of trans damage, since the transmission cannot turn. (most use oil from pump to keep gearsets cool...when towing, pump is not pumping and over time and distance it can damage trans internals.)
Hope your problem is just low fluid and not a rebuild...keep in mind what I said though.
Posted on Jun 09, 2009
I also have a 2002 Envoy. Shifting to and from 4wh and 4wa can be done on the fly but shifting to 4wL has to be done stoped and while in neutral. Try that. Otherwise I'm afraid its a new computer for you. Its located under the left rear seat and you need a loan for one.
Posted on Sep 18, 2009
Try disconnecting the battery for a few minutes, that might get you out of trouble for now. There are some common problems with these 4wd systems. Most common is the mode position sensor on the encoder motor. Sometimes it can be the switch on the dash. Fact of the matter is I can't tell you what is wrong without using a scantool to retrieve the fault codes from the computer controlling the 4wd.
Posted on Oct 16, 2009
my name is michael. You said it will go into 4 low but not into 4 hi. Have you lifted the truck to see if it is operational? Does your 4x4 light come on? Does it grind into either 4 hi or low? And one thing, has anyone ever taken the axle out on the right hand side? Please feel free to email me at MOFRACKY1@hotmail.com.
Posted on Jan 30, 2010
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