I have a 94 chevy 1500 4x4 the 4 whell drive is not working now the transfer case is good and i just replaced the accuator in the front axel it was bad it is working now but not engaging the front diff

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Hello tmaxx31190
Start by checking fuse #7 a 15amp fuse in the fuse block under the left side of the dash. This fuse is for the accuator motor on top of the left front axel tube. The accuator moter engages and
disengages the front axel for 4wd and 2wd. If the fuse is good, have someone operate the switch
and check to see if the accuator is working, you should be able to hear it engage or disengage.
If it's not working check the connections and for power at the accuator before possibly changing it.
If the accuator is working, it could be a problem with the shift fork inside the differential. Also, have
someone start the truck and engage the 4x4 then look to be sure the output shaft from transfer case to the front axel is turning. The safest way to do this is to have all 4 wheels up on jack stands.
Hope this is helpful.

There is a clip on the pumpkin (front diff) that the 4wd cable connects to that is common to break. Easy fix, inspect the cable where it connects to the pumpkin and repair any damages found.

Thank you for using fixya and keep us posted.

Check all the vacume lines. There is a 3 hose connector on top of the transfer case check to make sure those are good. I had the same problem and found the vacume accuator underneath the battery was bad. You have to remove the battery and battery holder to access the accuator.

Does the vehicle still have 4 wheel drive... or is it just the light that isn't working. I don't mean to insult you, I'm just asking if that's the case. You may just have a burnt out light. Most of these lever shift transfer cases are pretty straight forward, they either work, or they're so busted up inside that they make terrible noise.

Normal thing that happens as long as onone (worked) on it, is the vacume hose going to the engage sevevo under the battery box has fell of on either end or is brocken on the way there. Then the once or now leaky battery acid ate up this same servo. then the cable going to the front axel breaks sticks falls off or even someone needing one climbed under your truck while parked somewhere to get one to replace their brokeen one now you don't have one then theaxel engage arm or gearset is damaged

Is it auto push button. If so there are more probles could be than just one.(push button) blown fuse, now power to the switch, no power to the vacume accuator or vacume. mabe differnt size tireds, but chances are good that its a vacume proble,

when the transfer case shifts into 4wd it activates a vaccum switch on the transfer case which sends vaccum to the accuator for the front axle. the accuator pulls a cable that locks in the axle. the switch on the transfer case is a well known problem. check for vaccum in and out of this switch in 4wd. if you have vaccum out then check the accuator under the battery. If the vaccum switch on the transfer case is bad you can find one at most parts store in the HELP section #49315. please rate if this helps

Check the solenoid at the front axel. This is a rather common prob. First check that power is at the axel, got power, clean and put it back. Please do not even look at the tranfer case! At worst you may need to replace the axel solenoid! Frankster016

If you have auto locking hubs then you need to see if you are getting good vacuum to the front axel and check for a blown fuse or bad accuater