4x4 questions
Thread Starter
Junior Member
Joined: Jun 2013
Posts: 55
Likes: 0
Year: 1990
Model: Cherokee
Engine: 4.0 renix
4x4 questions
Alright y'all.... My 90xj is having a 4wd issue. Seeing as I just moved to Kansas and winter I'd fast aproaching , I'd like to have my 4wd. So here's the deal...when I lock it into 4wd lo, you can feel the low shift points and as if the tranny and xcase are working. But front tires don't spin like they are locked in. I have tried on pavement, dirt, gravel, sloppy mud, etc nochanges . any idea on what I might be would be great. Any way to test anything. I'm thinking its the vacuum locker on the front axle
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Trending Topics
CF Veteran
Joined: Nov 2013
Posts: 1,347
Likes: 0
From: Wetumpka, AL
Year: 1987
Model: Cherokee
Engine: 4.0
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran
Joined: Nov 2013
Posts: 1,347
Likes: 0
From: Wetumpka, AL
Year: 1987
Model: Cherokee
Engine: 4.0
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
James, see that the rubber block with the vacuum connections is on the disco. They fall off easily, causing some to S-can the whole deal. 
A long zip-tie on that loosely, will hold the vacuum lines on...usually. The bad disco fork casting on the earlier was fixed before your 90.
Btw Pete, one poster just moved it over and siliconed the ports! The air pressure can keep it engaged, (if you want your pinion, drive shaft, and a bunch of stuff in the transfer case spinning all the time)
A long zip-tie on that loosely, will hold the vacuum lines on...usually. The bad disco fork casting on the earlier was fixed before your 90.
Btw Pete, one poster just moved it over and siliconed the ports! The air pressure can keep it engaged, (if you want your pinion, drive shaft, and a bunch of stuff in the transfer case spinning all the time)
Last edited by DFlintstone; Oct 3, 2014 at 10:25 PM.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
James, see that the rubber block with the vacuum connections is on the disco. They fall off easily, causing some to S-can the whole deal.
A long zip-tie on that will hold the vacuum lines on...usually. The bad disco fork casting on the earlier was fixed before your 90.
Btw Pete, one poster just moved it over and siliconed the ports! The air pressure can keep it engaged, (if you want your pinion, drive shaft, and a bunch of stuff in the transfer case spinning all the time)
A long zip-tie on that will hold the vacuum lines on...usually. The bad disco fork casting on the earlier was fixed before your 90.
Btw Pete, one poster just moved it over and siliconed the ports! The air pressure can keep it engaged, (if you want your pinion, drive shaft, and a bunch of stuff in the transfer case spinning all the time)
Thread Starter
Junior Member
Joined: Jun 2013
Posts: 55
Likes: 0
Year: 1990
Model: Cherokee
Engine: 4.0 renix
I hate vacuum
I hate vacuum with a passion so what's everyone's take on the posilock cable? Does it work the same in principal? And also I think my tps is going bad because tranny fluid is fine but its shifting real early no matter how much throttle and it takes a few seconds to turn off after I turn the key off
Thread Starter
Junior Member
Joined: Jun 2013
Posts: 55
Likes: 0
Year: 1990
Model: Cherokee
Engine: 4.0 renix