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Yeah, it may be a bad switch or faulty wiring harness. I have some other problems besides the wiring/switch deal. When engaged in 4hi, the front pulls left then right, back and forth pretty strongly (yes, that's driving in the snow). I drained and replaced the fluid in the t.c. and front diff. I took it for a test drive on a thick gravel road and shifted into 4hi. I shifted fine and I drove it for a few minutes with all of the above described pulling. When I went to shift back to 2wd, it wouldn't happen multiple times pushing 2wd and 4hi. Just to see what would happen, I put it in Neutral, shifted to 4low...yeah that worked, just because it entrapped be into being stuck in 4low. I was close to the house by then so driving forward and back...pushing buttons...using manuals instructions to shift to neutral...pulling fuses....disconnecting the battery...it wouldn't go back to 2hi. I finally yanked of the dash piece surrounding the steering column, yanked and stuffed some wires because I was so ******, unhooked the 4wd switch and put it back together. NOW it is shifting again. I praised the Lord. One problem possibly figured out. Either a bad wiring loom or a bad switch. Hope that helped.
It is either the control switch or the actuator. look if light is flashing on push button switch. if so it is stuck. you can check actuator on front axle, to watch and see if it is moving.
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Transfer Case Actuator (TC Motor): The transfer case actuator, also known as the TC motor, is responsible for engaging and disengaging the transfer case. If it's malfunctioning or stuck, it can lead to issues like the one you're experiencing. Consider checking the actuator for any signs of damage or water ingress.
Transmission in Neutral: When shifting from 2Hi to 4Hi, ensure that your transmission is in neutral. Some vehicles require this step to engage the 4Hi mode successfully. Try shifting to neutral before selecting 4Hi2.
Rolling Movement: Another technique is to roll the vehicle slowly (forward or reverse) while attempting to engage 4Hi. Sometimes, this movement helps the transfer case engage properly. Give it a try and see if it resolves the issue.
Transfer Case Control Module: The transfer case control module (TCCM) manages the transfer case functions. If it's faulty, it might prevent successful mode changes. Diagnosing and testing the TCCM using a high-end scan tool (like a Tech 2 or Snap On) could be necessary.
Indicator Switch on Front Axle: If the 4Lo mode isn't engaging, check the indicator switch on the front axle. Sometimes, manually pushing it in while the connector is plugged in can help troubleshoot the issue.
Remember that diagnosing these issues may require professional assistance or specialized tools.
I'm assuming your refering to a Chevy S10? There should be a small gear shift lever next to the standard gearshifter marked as 2HI, 4HI, Neutral, 4LO. This is your 2wd/4wd shifter. 2HI is for normal everyday driving as it is only powering 2 wheels for better MPG. 4HI is the same gearing as 2HI but powering all four wheels. This is your 'normal' 4WD setting. 4LO is a set of reduction gears designed for serious 'Off Road' conditions and should not be used on public highways. Your top speed will be Very low in this setting and the engine will be maxed out at full revs to get it.
DO NOT leave this lever in the Neutral position without the park brake ON. This setting completely disconnects the transmission from the wheels regardless of the gear you have selected so it will roll even if you select Park.
Put truck in Neutral while key in run position engine off or on (doesn't matter which). If it's pushbutton 4wd then try hitting 4low again. if that doesn't work some of the chevy trucks required you to press 4hi to get into 4high and then press 4hi again to get back to 2hi, unless yours has a 2hi button. In that case press 4hi to get into 4high and then press 2hi to get back to 2wd. either way you need to be in neutral to get out of 4lo. I have shift on the fly (Mechanical Shifter on floorboard for transfer case) on my 1990 Suburban and still have to put it in neutral to get out of 4lo. Good Luck.
very common problem with chevy 4 wd switching in out of 4wd is the incriptor on the side of tranfer case goes bad.check for a tsb [tech service bullitin] you can google it will explain more detail
Shot in the dark but I have done this before! Back up at least 50 yards in reverse with the selector set to 4wd Lo come to a stop, put your transmission in neutral, shift the 4wd selector to 4wd hi wait for a few seconds, shift it to 2wd hi wait a few seconds then put your tranny back into drive and see if that takes it out of 4wd. Good luck
asker: Also, it helps if you're rolling at about 2 mph with the steering wheels straight. You cannot shift into 4LO with the wheels turned or when in a drive gear. Also, it may be that you need the electric shift unit serviced. It is not recommended to drive on dry pavement while in 4LO.
vacuum leak or vacuum locker solenoid problem. a great way to check for both is to remove both vacuum lines from the solenoid (located on firewall above destributor), and put a connector between them, push the button on the dash and see if it locks in.
Most common problem is the vacuum diaphragm that is so inconviently mounted UNDER the battery tray.The cable that locks in the front diff is attached to it and vacuum pulls it in/out.
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