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Old 04-21-2012, 07:04 PM
deadironrat deadironrat is offline
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NP229 Woes

Well after spending all day changing the fluid in the front diff, rear diff, transmission, transfercase, and adjusting the bands in the transmission, I've come to a new conclusion. The Wagoneer drives much better now, except it no longer works in 4wd high! . I decided that after changing everything the Jeep needed a good romping to break in its new fluid. But now when I give it more then about 1/4 throttle in 4wd high it stops moving and makes a ratcheting sound. 2wd works great, now matter how much I try to load up the drivetrain (I tried) it just keeps on going.

Any idea on what might be wrong causing it to have sudden issues with 4wd high?

I leave for Navy basic training in just over a week and I'd really like to have everything fixed before I leave.
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Old 04-21-2012, 08:02 PM
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wag4x6 wag4x6 is offline
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Sounds like the Viscous coupler took a poop.......
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Old 04-21-2012, 10:05 PM
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mdcptman mdcptman is offline
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Did th 4wd work before u did all that work? If so, then check ur vaccum lines to th transfer case vaccum shifter. It may be u disturbed some of th vaccum lines, and it is not getting enough vaccum to engage fully.
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Old 04-21-2012, 11:46 PM
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Carnuck Carnuck is offline
 
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Vacuum front axle not shifting and engaging will do that.
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Old 04-21-2012, 11:50 PM
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REDONE REDONE is offline
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Quote:
Originally Posted by Carnuck
Vacuum front axle not shifting and engaging will do that.

ditto!

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  #6  
Old 04-22-2012, 12:00 AM
FSJ Guy FSJ Guy is offline
 
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Quote:
Originally Posted by Carnuck
Vacuum front axle not shifting and engaging will do that.

EXACTLY!!

And I bet if you shift it into low range, the ratcheting will go away. BTDT.

Inspect the front vacuum motor and associated vacuum hoses. I bet a hose is loose, rotten or broken OR the vac motor is not working correctly.

DO NOT drive in 4wd high range in this condition. You will have to have your transfer case rebuilt as a result. (see above comment RE BTDT.)

Or you can solve the problem by buying a one year model newer FSJ. 85 and up FSJ's did not come with the front axle disconnect.
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Old 04-22-2012, 08:57 AM
deadironrat deadironrat is offline
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I believe you guys were correct about the front axle disconnect. I inspected it and found one of the hoses to be cracked just before it connects to the vacuum motor. I have to finish a trans cooler install on a Tacoma before I can try to fix it but I'll let you guys know if you are right.


Jacob
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Old 04-22-2012, 10:27 AM
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Tourettes Tourettes is offline
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Rather than swapping for a non vacuum shifting axle, just pin the shifter inside the pumpkin.

I cut a piece of old rubber gas hose and a hose clamp to "lock" the shifter in 4x4


Its a little tricky to get the cover back on, but with the plug removed makes it a bit easier.
The front axle will be engaged in 4WD all the time but will not BE in 4WD until the T-case sends torque to the forward driveline.
Its a really simple fix.
You'll still have the vacuum motor sticking out the top of your axle, but you can ditch 1/4 mile of problematic vacuum lines.
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Last edited by Tourettes : 04-22-2012 at 10:31 AM.
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  #9  
Old 04-22-2012, 08:19 PM
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blkwarrior blkwarrior is offline
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Thanks for posting that pic T, i have been asking about how this is done
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  #10  
Old 04-24-2012, 06:32 PM
deadironrat deadironrat is offline
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I just fixed the only vacuum leak I could find and it seems to have helped. It will now stay in 4wd high under normal driving conditions and even under fairly heavy loads, but under extreme loads it'll still jump out of something (gear? transfercase? front diff??). I'm not sure exactly what's going on. I think maybe the jeep is just trying to tell me to put the T18 and D20 I have sitting to good use.

Any opinions on what the issue could be?
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  #11  
Old 04-24-2012, 07:30 PM
joe joe is offline
 
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Check you're trans mounts. If they're shot they can allow the trans/tcase to twist popping the tcase into neutral. Worn out motor mounts can have the same effect.
Unless you're into doing a front axle swap forget the option of using your T18/D20 in an 84. Your front differential is on the wrong side for a D20.
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  #12  
Old 04-24-2012, 07:37 PM
FSJ Guy FSJ Guy is offline
 
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You could still be having issues with the front axle disconnect. It may be "disconnecting" under heavy loads.
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  #13  
Old 04-24-2012, 07:38 PM
FSJ Guy FSJ Guy is offline
 
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Your t-case also needs to be adjusted correctly. Both the mode and range levers need be "just so". The Chilton's manual actually has a nice picture and description of the procedure.

I don't know if it's on the web or not.
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