Four wheel gear

Asked by Feb 15, 2013 at 07:24 PM

Question type: Maintenance & Repair

The four wheel drive in my 87k5 blazer
won't disengage.  What could be causing

12 Answers

This isn't one of those models where you have to twist the little red lock at the center of the hub, but is fully automatic, vacuum motor, or servo which apparently has it's lines fallen off or the electrics have a blown fuse. it's time for you to be a sherlock holmes and take a looksee to find out which mechanism engages the rear wheels, certainly I can do this for you, but tell us a story as we get paid nothing.

Its an 87 k5 with 4.52 gears and manual lockers in the front axle. 700r transmission. As far as I can tell, the transfer case isn't disengaging fully.

alright, here's the right answer. a vacuum line become diconnected, here's a snip from a thread I was reseaching;The vacuum line to the 4wd acuator had come off. I'm guessing thats the problem with yours. It;s been 10 years since I helped him fix it so I can;t even begin to tell you where to find the acuator.

could take it a step further and try to find where this actuator is, but you're the one with the buggy that needs mendin', I'm just a guy wno sometimes knows where to find the right answer on the WWW, that doesn't make me a GURU more of a trained monkey-

has this not been satisfactory for you? You don't know where to look for the 4wd actuator? wasn't quite sure what you're getting at by desribing the vehicle to me once again,

You missunderstand. The entire system has been replaced. Its not a vacuum set up anymore. Its mechanical. I've been asking around and the general idea is one of two possibilities ... 1 the transfer case is about dead or 2 the previous owner welded the lockers in order to have permanent 4x4. I know he was going for a rock Crawler set up so I'm leaning that way. What are your thoughts on these two possibilities?

Go rock crawlin' explain to your truck, this is why you were born, and GO FOR IT! Have to say k5noob feel as though that I've been led down the garden's okay the bruises go away in time-



Bearings inside the hubs fords have this problem alot


this is a common complaint and commom problem , when your in 4wheel drive you must stop to dis enguage it and also move your vehicle in reverse for approximately 10ft and then back to drive and it will dis enguage . its commom even for a shift on the fly vehicle, you will see these instructions either in yoour hand book (owners manual) or on the visor of the vehicle .

Thank you for the help. I'm having it looked at tomorrow by an off road specialty shop. Lets hope for the best.


with 452 ,s its welded no doubt, bet your looking for better mpg ,take the front drive shaft off, unlock f hubs

Your Answer:


Maintenance & Repair Experts

  • #1
    Tom Demyan
  • #2
  • #3
View All

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.