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Unread 03-21-2013, 07:09 AM   #1
toner4
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Jeep will go 4low but not 4 high??

Hey guys my 1998 jeep tj won't go into 4 high but works great in 4 low. It sounds like it engages but when I let out the clutch it kicks out and grinds?? Any ideas?

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Unread 03-21-2013, 11:00 AM   #2
seattle_yj
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1993 YJ Wrangler 
 
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Location: Issaquah, WA
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Quote:
Originally Posted by toner4
Hey guys my 1998 jeep tj won't go into 4 high but works great in 4 low. It sounds like it engages but when I let out the clutch it kicks out and grinds?? Any ideas?
The first step is to remove the linkage and make sure that you are hitting the correct detents. If it is hitting the detents correctly then there is an internal issue with either the range fork or gear or shift fork. Worn input gear where the range gear meets the input gear can also be a culprit.

I'm going through one of my np231 at the moment and it is having the same issue you are having. When I pulled it apart there was nothing obviously broken, but a combination of multiple worn out parts will cause the grinding issue.
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Unread 03-21-2013, 11:28 AM   #3
toner4
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Thanks, it has a body lift on it as well and I see underneath that the shifters have been cut and lengthened maybe not far enough ahead when welded... Problem is I just bought the damn thing a couple weeks ago
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Unread 03-21-2013, 02:10 PM   #4
seattle_yj
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1993 YJ Wrangler 
 
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Location: Issaquah, WA
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Quote:
Originally Posted by toner4
Thanks, it has a body lift on it as well and I see underneath that the shifters have been cut and lengthened maybe not far enough ahead when welded... Problem is I just bought the damn thing a couple weeks ago
Order the novak shifter linkage kit. It's 180. You're going to need it anyway, might as well get it out of the way.
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Unread 03-21-2013, 02:18 PM   #5
toner4
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What exactly will and or does that do?
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Unread 03-21-2013, 05:16 PM   #6
seattle_yj
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1993 YJ Wrangler 
 
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Location: Issaquah, WA
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Quote:
Originally Posted by toner4
What exactly will and or does that do?
It replaced the problematic trunion, which will slide up and down. The fix is to use the rod ends in the kit. It also replaces the stick with a longer unit that you can custom bend. It also has the beefier mounting plate that goes between the trans and tcase.

I built my own from rod ends and threaded rod, because I, like you, was having a tcase issue, and I wanted to try that first. In the end the case just needed to be rebuilt and some questionable gears replaced. If I had to do it again, I would get novak from day one.
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Unread 03-21-2013, 05:17 PM   #7
seattle_yj
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1993 YJ Wrangler 
 
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Location: Issaquah, WA
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Here is a pic of the piece I fabbed to replace the trunion. I got the idea from YJames in the YJ section.
image-3728318736.jpg  
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