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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.
THE TRANSFER CASE MOTOR IS ONLY FOR 4WD LOW. That would have never been the problem as soon as you confirmed it shifted into 4wd Low. 2wd and 4 Hi work off of vacuum. You may have one or two issues. A vacuum leak up by the front axle that engages the 4wd HI or the sensors on the transfer case.
check the trasfercase shift control module and wiring
it's located on the passenger side
remove the carpet thresh hold
remove the kick pannel they are held on by clips
the module is behind the kick pannel
disconnect the module harness and see if it is corroded if so you need to replace the connector and the module
let me know if thats not it but i have done lots
THE 4WD SWITCH IS A PROBLEM. ALSO THE GROUND CONNECTOR ON THE FRAME CLOSE TO THE DRIVERS DOOR IS A PROBLEM. IT USUALLY HAS A COATING OF THE UNDERCOAT MATERIAL ON THE FRAME THAT IS NOT REMOVED BEFORE THE CONNECTORS ARE PUT IN PLACE.
THERE ARE 2 BOLTS THERE THE OTHER IS AN ABS GROUND CLEAN OFF THE UNDERCOATING FIRST, PUT DIELECTRIC GREASE ON THE CONNECTION POINTS, THEN COVER THEM IN SPRAY ON UNDERCOATING. THIS IS A CHEAP FIX TRY IT FIRST.
If they are blinking I believe it means that there are fault codes present in the pcm. You need to get the computer scaned to see if there are an codes present. If you live near an Autozone or Checker autoparts they can scan it for free.
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.
Make sure that all 4 tires have the same tread on them, if one or more of them are different, then the 4wd may not engage. I had the same problem with my blazer, I changed only 2 tires at a time. The front tires would rotate faster than the rear ones, the gears in the transfer case won't line up right.
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