NP-229 Transfer Case, Slips into Nuetral - JeepForum.com
 
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post #1 of 4 Old 07-17-2017, 08:25 AM Thread Starter
skylarxj106
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1983 FSJ Wagoneer 
 
Join Date: Mar 2013
Location: kentwood
Posts: 17
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NP-229 Transfer Case, Slips into Nuetral

-I'll keep it as short as possible and provide further details.

-Np-229 transfer case on a 1983 wagoneer is slipping in between 4wd and 2wd. While driving it falls out and i can hear a grinding noise in park and reverse. to get it back into gear I have to stick transmission into neutral, crawl under my jeep, disconnect the 4wd-2wd linkage, then I need to push the linkage towards the transfercase while kicking the jeep backward with my foot against the tire to reengage the axle. At this point I leave the linkage disengaged because it inevitably falls out again less than a mile down the road, rinse and repeat and limp back home.

-I modified the linkage so that it is so long that it can not move from any position other than two wheel drive. It still falls out and i have to do again what was described above, pull it off and move the jeep while pressing the linkage back in. This seems to reengage for a while.

-I drained about 1/2 quart of fluid out of the T-case and refilled it with 3 quarts... It was at this point that the T-case worked consistently for 30-40 miles without going out, usually went out every mile. Then while on a highway it cut out on me again... I thought filling it up fixed it! Anyways, I can still pop it back in by performing the same task, crawl under, transmission in neutral, disconnect linkage, press towards transfer case and kick the jeep backward while under it!

-So, limped back home now, sitting in the driveway, there is a small leak from the t-case....But it is small, i mean maybe a drop or two every hour and i filled it up less than a week ago. I am ready to fill it up again and try fixing wherever the leak is coming from but I can't crawl under it on the side of the highway again(steep banks/hills and no shoulders).

Could low fluid cause my T-case to slip into neutral?
Could the linkage not being properly aligned cause it to slip out even when already in gear? I assume there is some sort of mechanism to keep it in gear besides the linkage.


I abandoned the vacuum motor a long time ago and just stuck it in 2wd, the car is a summer only town car, I don't require 4wd nor will it be hitting any trails, not my daily driver but it used to be for 3 years.

At this point I am going to try to fix the leak but any advice input would be really helpful, if fixing the leak doesn't work I'm going to drop the t-case out and try to open it up and investigate, any input as to what could be causing this would be extremely helpful. No$$$ for new T-case, I know this is the popular go-to with drivetrain problems but If there is a simple fix I want to try anything.

Thanks for your time reading this, this has already been submitted on the IFSJ forums as well but I'm looking for help wherever i can find it.

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post #2 of 4 Old 07-17-2017, 09:58 AM Thread Starter
skylarxj106
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1983 FSJ Wagoneer 
 
Join Date: Mar 2013
Location: kentwood
Posts: 17
Garage
Even some passing knowledge on how T-cases work would be helpful, I'm know enough to get by on engines but Drivetrains are a whole new arena to me.

thanks,

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post #3 of 4 Old 07-17-2017, 07:22 PM Thread Starter
skylarxj106
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1983 FSJ Wagoneer 
 
Join Date: Mar 2013
Location: kentwood
Posts: 17
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well, I put my wheels up onto blocks, transmission in neutral. Operated the linkage, manually operates well, switches between 4wd and 2wd, I can recreate the "neutral" condition where it sounds like the gears are trying to mesh. I'm thinking this is simply a linkage issue and not something more serious.

I am going to try stick it into 2wd right now, although i have tried before and that did not work :/

Will eventually be buying a twin stick shifter mechanism instead of replacing the vacuum motor, I think it will work much better.

I'll keep posted if I fix it for future reference

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post #4 of 4 Old 07-18-2017, 10:46 AM Thread Starter
skylarxj106
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Join Date: Mar 2013
Location: kentwood
Posts: 17
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So, "Chevelleguy" over at the IFSJ forums suggested that I probably have worn out mode fork pads. This is most likely, I will try to F*** with the linkage a bit more but it's looking like this will be what I have to do. probably will simply be pulling the old one out and replacing the $10 forks instead of buying a new T-case. I will post pictures/updates for anyone in the future

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