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An expert who has answered 20 questions.
Re: 4 wheel drive not disengaging
Make sure that all the tires are identical in size and pressure. Try leaving it in 4wd going into some loose sand right side wheels, placing it in 2wd and rocking it back and forth a few feet at a time. If any one the wheels on the vehicle is different from the others, then it rotates at a different speed, placing stress on the axles and gears, and also on the collar/sleeve that couples them together, preventing it from disengaging. If this is the problem, you have to figure out how to get that stress off of the connection before it will slide apart. Good luck. Chip
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Could be 2 or 3 different things. Find the Trouble Code by Grounding out the 13th point in the plug, where the analizer (under the dash) would plug in. Turn the key on but don't start the engine. Count the blinks of the 4 wheel drive lights. 4 total blinks or 3,2,1. Each blink tells you where the problem is located: Switch, control modem, shift motor, or wiring. Ask your Chevy garage for the code information out of manual. GOD BLESS & GOOD LUCK....
Does it shift to 4wd high range ? If so then shift to 2wd . What is going on here is the transfer case motor is stopping due to the motor position sensor has gone bad which means that you replace the transfer case motor assembly. But if you wish to make it a 2wd for awhile then remove motor and manually turn shaft . This can be done by raising and supporting rear axle truck in park remove motor turn shaft slowly with pliers and rotating the play in drive shaft. There are stamped markings on back of case showing gear positions..
It is your 4 x 4 electronic shifter at fault. Located on your transfer case it is mostly black/brown plastic electronic switch that engages and disengages your transfer case from low, high 4 x 4 or 2 wheel drive.
Check connections for electric continuity and replace it if there is no power...
Be sure to put the truck in neutral, while engine is running, while you disengage from 4 wheel drive (low) to 4 wheel drive (high) and then finally to 2 wheel drive. It is critical to shift transmission into neutral when switching out of 4WD Low, as indicated in your owner's manual. Hopefully, this will help to FixYa problem!
what sounds like is happening is the front end is not disengaging, it will not hurt it to drive without the module, but you need to find out why the front diff. actuator is not releasing. their is a shift motor on the transfer case, module and switch in the cab, and actuator on the front diff. all are susceptable to water, I would suggest getting a manual on it to aid in diagnostics
As I recall the 96 blazer had electronic shifting for 2wd to 4wd. There should be a small panel on the drivers dash buttons for 2wd, 4wd lo and 4wd hi.
Simply press the desired button while stationary and if the system is functioning properly then it will shift and the light for the engaged type of drive will be lighted. Generally you would like to be in 2wd for this vehicle.
are any of the lites on the switch flashing? you may have a sticking 4x4 shift motor on the transfer case. with a helper, key on someone under vehicle at shift motor, one operating the 2wd button, give shift motor a rap with small hammer on metal portion of shift motor to see if you hear it trying to work. to access control module, remove plastic right kick panel and its right there. remove connector and inspect for corrosion or bad connection. also try park and neutral, may even have to be rolling a bit to disengage. let me know how you make out and will help further if i can. do you know what transfer case system you have? np1 or np4?
Put the transmission in neutral, emergency brake off, foot off the brake pedal, now try shifting out of 4 wheel drive low. If that doesn't work, drive forward, and again do the above, trans. in neutral, roll to a stop, foot off brake, try to disengage. What you're probably experiencing is called drive shaft 'wind up', and it is very difficult to disengage, but do the above and it should shift out of 4 low. countrycurt0