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Unread 08-14-2006, 10:41 PM   #1
mrtosh
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noob needing some help...

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Please help. Noob..

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Sorry, I didn't really know where to post this. I just bought a '89 Cherokee Laredo l6, 5spd., w/about 195,000 mi on it. The problem I'm having right now is that when it's in part time or 4hi, driving down the road I get a random clunking in the front end you can even feel it under your feet. Anybody know what this might be? I'm wondering if the fork in the front end isn't quite engaging all the way...? I did however get underneath and check the vacuum hoses that lead to the solenoid on the front axle. They were very loose(just pulled right off). The clunk is pretty noticeable. I'm pretty sure it's not the tranny mount, seeing as how I can be going in second at about 3,000 rpm holding steady and it will just randomly clunk. Please help guys..

Sorry for the long post...

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Unread 08-14-2006, 11:07 PM   #2
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anybody???
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Unread 08-14-2006, 11:19 PM   #3
EMTimZJ
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Does it do it in 2wd? You should not be in part-time when on the street anyway, your TC will bind.

Sorry I am not very familiar with the vacuum CAD Dana 30 (CAD = central axle disconnect)

HTH
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Unread 08-14-2006, 11:24 PM   #4
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I haven't felt it in 2 wheel. Only 4hi...
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Unread 08-15-2006, 01:56 AM   #5
96JXJ
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Check the u-joints on the front axle shafts. JIM.
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Unread 08-15-2006, 02:16 AM   #6
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Update: Did do a little muddin' this evening. In 2wheel w/the rears spinning it made the sound again. It was definently coming from the front though. It almost sounds like something spinning then hitting something. W/the rears spinning it would clunk........clunk..... Then after a few times going back through it was gone...??? I even put it in 4 hi and drove through the mud. All was ok no clunk. I did however go back on the gravel road and going straight in 4hi, holding steady at 3,000 rpm's in third, it did it again, clunk.... Put 'er back in 2 hi and problem gone. Whaddya guys think.
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Unread 08-15-2006, 02:18 AM   #7
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When at speed, it almost feels like it's slipping up front somewhere..
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Unread 08-15-2006, 04:24 AM   #8
JeeperDon
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That old with that mileage, check everything!! Nothing down there is meant to last that long (u-joints, bushings, ball joints, steering rod ends, shocks) and you have no idea what got replaced when. Assume everything is bad and check them one by one to figure out what isn't.
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Unread 08-15-2006, 09:04 PM   #9
Jakemd98
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check the front drive shaft... mine does something simular and i have a loose front drive shaft that needs replaced.
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Unread 08-15-2006, 10:03 PM   #10
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I checked the u-joints, axle shafts, even the tranny mount. All seems clear. I called the previous owner and asked if it had ever done that to him before. He told me it did something similar when he had a bad vacuum leak in the manifold. It does have a vacuum leak somewhere. It idles up and down, and if i pump the brakes, the idle goes up....

I'm wondering if it loses vacuum at higher rpm's and causes the fork in the front end to disengage.... Sound farfetched??? I'm thinking of replacing the vacuum lines from the solenoid to the metal lines w/vacuum line.. Worth a try. What do you guys think?
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Unread 08-15-2006, 10:49 PM   #11
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Is there anyway it could be the tranny mount? Kinda weird that it happens at a constant speed. I'm wondering also, if it could be vacuum related. Like the fork isn't engaging or holding in place at upper rpm's... It's an out there guess but i don't know......
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Unread 08-15-2006, 10:54 PM   #12
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By the way my part-time light has been flashing on and off. Could this be vacuum related as well?
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Unread 08-16-2006, 10:54 PM   #13
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So when I'm on the throttle the part-time light goes out. When I go to upshift and let off on the gas, the light comes on. Whaddya guys think? And where does the black line from the shift actuator go to on the firewall?
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Unread 08-17-2006, 05:50 AM   #14
JeeperDon
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I know this true on a YJ, might be on yours too. Here is the logic: The light switch activated by the motion of the axle disconnect shift fork. The shift fork is driven by engine vacuum, both engaging and disengaging. However, the mechanical shift fork has a light weight spring it in forcing the fork in the disengaged position [maybe to be sure the system is fully in one state with no vacuum at all present]. This spring is easily overridden by a proper vacuum system, so 4wd stays engaged. So, if vacuum gets poor while in 4wd, the spring could tend to disengage 4wd, which would turn the light off.
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Unread 08-17-2006, 12:00 PM   #15
mrtosh
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When I'm in two wheel is when the light comes on and off, coenciding w/the throttle... In 4wd the light changes randomly. Dont know. I might change the vacuum lines and just zip tie everything down, and see what happens.
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