93Cherokee2wd

working on a 1988 cherokee 4.0 auto having trouble getting the front axle to dis engage think there is a vacuum problem it will engage fine but no vacuum to dis engage any help ????

Nissantech

Check the connections at the axle there is a vacuum block with I believe 3 hoses white green and black I think . I had an 88 with the same problem, ended up being a hose. Good luck!!!

Nissantech

Also the hoses are on the passenger side of the axle, someone makes a kit to delete the vacuum actuator or I've read there is something you can yourself.

93Cherokee2wd

Nissantech do you remember witch hose ? it acts like it does not move from 1 port to the other

cruiser54

Just ditch that worthless setup and be done with it.

CAD STINKS


The big issue is that the CAD system only fails when you need it the most.

Kinda like when you don't realize your wiper blades need replacing until it rains....

I know somebody’s system works and he advocates keeping it stock, but my exposure to the failures is probably hundreds of times greater than his, as a result of being Service Manager at a Jeep dealership from 1980 through 1992, and being a current XJ and MJ owner.

CAD stinks. Every Jeep I work on with it, I eliminate it. Guess what I find in the process? 25 year old busted vacuum lines, bloated vacuum line connectors, bad vacuum reservoirs and piping, bad transfer case vacuum switches. In other words, had the person gotten into a sticky situation and needed 4WD, they would have been screwed!!!

That's the tip of the iceberg. The factory went through 3 revisions of the shift fork also. The fork issue is non-existent if you just slide it over and leave it.

See the link below for complete instructions. Takes less than 1/2 hour.

https://www.cherokeeforum.com/f51/fre...ss-91-a-38629/
,

93Cherokee2wd

the problem with that is it is full time 4wd in the 88 front drive shaft is always spinning even in 2wd

cruiser54

No, it's not in 4wd all the time when you eliminate the vacuum stuff.

4WD is controlled by the transfer case lever only.

Did you READ the whole thing I posted?

93Cherokee2wd

when we were messing with it the front shaft was spinning in 2 wd and when you moved the lever to 4 it locks the cad is there a problem with the trans fer case it was working great but he put it into 4 wd to show somebody and it would not come out

cruiser54

Probably not shifting it correctly.

Here's how the factory suggests you shift the transfer case and I've been doing this since these things were new and I worked at the dealership. Quoted from the owner's manual. The suggestions in CAPS are mine.

"To engage, shift the transfer case lever from 2H to 4H while the vehicle is moving at any legal speed". I LET OFF THE GAS, THROW THE LEVER, TAP THE GAS AND LET OFF.

4L position: " To engage, slow the vehicle to 2-3 MPH , shift the transmission to Neutral, then shift the transfer lever to the right and pull firmly rearward to 4L".

TO SHIFT OUT OF 4L, SHIFT THE TRANSMISSION INTO NEUTRAL WITH THE VEHICLE STOPPED, SHIFT THE TRANSFER CASE LEVER TO 2H, THEN THE TRANS TO D IF YOU HAVE AN AUTOMATIC, OR INTO FIRST GEAR WITH A MANUAL, AND CONTINUE ON.

Revised 11/20/2014

freegdr

Check for vacuum at line when transfer case is switch from 4wd to 2wd yet ?

LadyKenai

clean the whole assembly take it out and blow and suck on it *lol* see if it moves but watch your fingers, i had a lot of dirt in mine and after cleaning it went a lot smoother, sand and dirt build up. you will lose some differential fluid unless you jack the right passenger side up.

marc