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1991 Jeep Cherokee 4 wheel drive

Tiny
JOSH MONROE
  • MEMBER
  • 1991 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 317,078 MILES
My 4 wheel drive does not work, I can put it in 4wh and 4wl and drive shaft turns but it doesent lock it into the axle, I look inside the diff and there is nothing wrong with the pinin or anything else the axle is good, I looked at the shift fork and thats good to, I have replace my transfer case, I changed all the oli. I dont know what else to do
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Monday, January 5th, 2009 AT 12:51 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi:
There is a vacuum control block on the axle. Is it getting vacuum?

Joe
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Tuesday, January 6th, 2009 AT 4:14 PM
Tiny
JOSH MONROE
  • MEMBER
  • 3 POSTS
Yes its getting vacuum to it, but both the vacuum lines are sucking in air is that bad or good? See I asked so many people about the vacuum lines but and noboudy knows
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Wednesday, January 7th, 2009 AT 11:48 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi:
I believe you should get vacuum to one at a time based on the shifter selection. Try this test. Disconnect one line and plug it with a screw or colf tee. Se if the 4wd works. If not, try the other hose to see if that helps. If it does, there is a vacuum solenoid that is on the top of the transfer case that may be the problem.

Let me know what happens.

Joe
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Wednesday, January 7th, 2009 AT 1:41 PM
Tiny
JOSH MONROE
  • MEMBER
  • 3 POSTS
Ok this is what I did, the two vacuum lines that come up to the engine compartment I put them on the same vacuum line so now they both suck in air, when I hook up both vacuum lines to the shift motor and put it in 4wd it doesent do anything but if I take one of the vacuum lines off the shift motor. It will lock in 4wd but if I try to take it out of 4wd and one of the vacuum line is still in the same hole it wont unlock the axle. I took the shift motor out and hook it back up to the vacuum lines so I can see what it was doing it did the same thing. Nothing happen untill I unhook one of the lines then it moved
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Wednesday, January 7th, 2009 AT 3:30 PM

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