I have a 1995 Silverado, I bought it recently and knew the 4x4 didnt work. When I shift the floor shifter to engage the 4x4 it does nothing. But, when I shift it into low 4x4 it grinds like its trying to engage but it doesnt. What could be the problem?
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Can you supply more information? year and model of vehicle, does it have an actual shifter lever or buttons? and what are all the available options to shift into?
If you have a honest mechanical manual 4x4 that you reach down to the floor and shift into 4x4 with a lever, and 4x4 doesnt work you got problems with your transfer case or you got some bent or missing linkages.
if you have a push button system for 4x4, then you could have a number of problems, bad actuator motor, bad wiring, etc.
This is for 4x4 shifter on the floor.
In the front of the truck on the axle there's a plastic cover with 2 10mm bolts remove it and spray down the shifting actuator it operates on vacuum. You might have to pull it in four wheel and check to see if the vacuum pod is engaging the shift lever on the axle. Then again you might have to replace it very easy to do. But I would spray it down with some WD-40 it should work.
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.
O.K.,tried to get you to tell me more about the problem, but did not see an answer. I find it hard to engage the shifter...have to almost force it... also it takes bit before it actually engages... If I am remembering correctly the truck must be moving as shifted and usually does not engage until turning slightly... this is only from experience (not an expert) and I could count the times I've needed 4x4 to be less than a dozen times since I bought the truck 2 yrs. ago