Re: 92 full size blazer shifts into 4 high and low and...
I have a 93 full size blazer and might be able to help. First you need to ensure that your are actually not engaging the hubs. To do this, shift into 4H or 4L and try to turn very sharply. If it is difficult to move forward with the wheel turned all the way, you are probably in 4WD and the indicator light may be out.
If the truck drives as it does in 2H, your front diff is not engaging. If this is the case, there is a thermostatically engaged actuator that may have failed. These fail occasionally and can be purchased at most auto part stores or at the dealership. Before you buy a new one, use a voltmemter to ensure that voltage is present at the actuator when you engage 4H or 4L.
I know several companies make a manual pull cable style activator that can replace the thermostatically engaged unit.
Lost more info here: http://www.automotiveforums.com/t173603.html
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full size blazer? if so do you know if you have auto locking hubs on front or manual? the manual will have a dial to turn to lock or free. to shift into 4 high this can be done by just moving the shifter into 4hi at slow speeds. to shift into 4lo need to be in nuetral with vehicle stopped or rolling just a little bit like 1-2mph shift into 4 lo and shift back into drive same when shifting back into 2hi from low range.
I HAD A BLAZER WITH THE SAME SYMPTOMS REPLACED THE TRANSFER CASE MOTOR AND SOLVED PROBLEM. TRANSFER CASE MOTOR SHIFTS FROM HIGH TO LOW GEAR IN THE TRANSFER CASE AND TELLS THE FRONT ACTUATORS TO INGAGE FRONT HUBS . MOTOR WON'T MOVE TO 4 HIGH AND GRINDS WHEN TRYING TO MOVE TO 4 LOW, TRANSFER CASE MOTOR FAILING . CHECK VACUUM LINES AND ACTUATORS ON FRONT DIFF THEY FAIL, CAN CHANGE TO CABLE ENGAGEMENT INSTEAD OF FAILURE PRONE VACUUM ACTUATORS.
I cannot understand why u would ever need 4L but anyway try this: after not working once move your vehicle about 6 inches backwards then try again. if no results move veh fwd about 6 inches and try again. if this doesnt word, im lost. good luck. ps: dont engage emerg brake
it will be very noticeable in low range verse high range has a big gear reduction so you would notice truck very jumpy and revving high when taking off. if you are having problems getting out of low have vehicle in nuetral when switching sometimes helps if truck is rolling just a little so when you are going about 5mph shift into nuetral and let truck roll flip it into high range will usually hear a clunk from shaft when it shifts
Your blazer is equipped with a shift on the fly four wheel drive. That means that at speeds less than fifteen miles per hour you can shift into or out of four wheel drive by simply pushing the four wheel high button. If you wish to shift into four wheel low. Stop, put the transmission into park or neutral, and push the four wheel low button. Same procedure for shifting back out. Never shift into or out of four wheel low while moving. And be careful in four wheel low. At full throttle your still barely moving, you don't want to blow your engine up!
checkunder the battery pan there is a bellows type of thing acid got on mine and ate the connection up i replaced this unit and 4wd worked by the way u only have 2wd low the transfer case has shifted the the trannie output to low range rear tires will spin not the front the cable that broke shifts a fork in the front pig 2 get the front wheeles engauged not a master tech it happened to me bout 4 years ago
1- STOP THE VEHICLE
2- MAKE SURE IS IN NEUTRAL POSITION
3- ACTIVATE 4WD (HIGH) MODE( MANUAL OR ELECTRONIC SWITCH SELECTOR
4- MOVE LEVER SHIFT TO ''D' DRIVE POSITION
IF THIS DOES NOT RESOLVE CHECK TRANSFER CASE SWITCH