86 4x4 shifter issues - JeepForum.com

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post #1 of 21 Old 10-06-2013, 08:35 PM Thread Starter
Tyler980
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86 4x4 shifter issues

I went and played in the sand today with my girlfriend and her XJ, I went to put it into 4LO and when I pulled it all the way back, the jeep would roll backwards, and it was as if it was in neutral.... I pushed it back forwards to try 4HI, and it grinded as it passed neutral and then 4HI worked.... So I then pulled it back again into neutral, and that engaged 4LO, but if I pull it back to where 4LO is, drops gear again. I have noticed that when i put into 2HI it doesn't go all the way forward, it seems like something is messing up the function here. The guy I bought the jeep off a few months ago said he just put all new 4x4 vac lines, and i never had an issue with it, it always switched between 2hi/4hi/4lo no problem, till tonight. not sure what to do..

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post #2 of 21 Old 10-06-2013, 09:43 PM
infob
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Sounds like the linkage came out of adjustment... I have never adjusted it before though so I couldn't walk you through the process
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post #3 of 21 Old 10-06-2013, 09:47 PM Thread Starter
Tyler980
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That's what I was thinking... I've never done it either, so hopefully someone will chime in on how to check linkage/fix linkage. I also was wondering if its possible for something to fall down into the shifter like a screw and mess with anything... 'cause its a possibility that a screw fell in there at some point.
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post #4 of 21 Old 10-06-2013, 10:00 PM
infob
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Quote:
Originally Posted by Tyler980
That's what I was thinking... I've never done it either, so hopefully someone will chime in on how to check linkage/fix linkage. I also was wondering if its possible for something to fall down into the shifter like a screw and mess with anything... 'cause its a possibility that a screw fell in there at some point.
That I'm not sure on... On a side question have you been shifting into 4 lo while in gear? I'm not sure if that would cause any harm but i always do my tcase shifting while in neutral
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post #5 of 21 Old 10-07-2013, 06:07 AM
cruiser54
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Here's how the factory suggests you shift the transfer case and I've been doing this since these things were new and I worked at the dealership. Quoted from the owner's manual.

"To engage, shift the transfer case lever from 2H to 4H while the vehicle is moving at any legal speed". I let off the gas, throw the lever, and then tap the gas and let off.

4L position: " To engage, slow the vehicle to 2-3 MPH , shift the transmission to Neutral, then shift the transfer lever to the right and pull firmly rearward to 4L".




Transfer Case Linkage Adjustment

Straight from the FSM:

SHIFT LINKAGE ADJUSTMENT
(1) Shift transfer case into 4L position. (make sure your shifter is fully in the 4L position)
(2) Raise vehicle.
(3) Loosen lock bolt on adjusting trunnion (Fig.
87).
(4) Be sure linkage rod slides freely in trunnion.
Clean rod and apply spray lube if necessary.
(5) Verify that transfer case range lever is fully
engaged in 4L position. (you can do this under the vehicle at the transfer case)
(6) Tighten adjusting trunnion lock bolt.
(7) Lower vehicle

If you own a Renix Jeep, you'll want to check this out.

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post #6 of 21 Old 10-07-2013, 07:28 AM Thread Starter
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Thank you, I don't have a lift so I'll have to try and do this from under it :P
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post #7 of 21 Old 10-07-2013, 08:05 AM Thread Starter
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and to try and figure out what a trunnion is lol and what this linkage looks like.
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post #8 of 21 Old 10-07-2013, 08:05 AM Thread Starter
Tyler980
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Quote:
Originally Posted by infob View Post
That I'm not sure on... On a side question have you been shifting into 4 lo while in gear? I'm not sure if that would cause any harm but i always do my tcase shifting while in neutral
I've always shifted completely stopped and in neutral.
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post #9 of 21 Old 10-07-2013, 02:28 PM
cruiser54
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Quote:
Originally Posted by Tyler980 View Post
I've always shifted completely stopped and in neutral.
Not good except for 4 low, after you've shifted into 4 high while moving. Perhaps you should try that before "adjusting" anything?

If you own a Renix Jeep, you'll want to check this out.

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post #10 of 21 Old 10-07-2013, 02:29 PM Thread Starter
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So I should be driving, go to 4hi... then stop and go to 4lo and see if that changes what its doing? Do I keep tranny in drive when I shift to 4hi?
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post #11 of 21 Old 10-07-2013, 02:40 PM
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Quote:
Originally Posted by Tyler980 View Post
So I should be driving, go to 4hi... then stop and go to 4lo and see if that changes what its doing? Do I keep tranny in drive when I shift to 4hi?
Keep it in drive. Get it into 4H. Stop. Put trans in N. Shift to 4L.

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

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post #12 of 21 Old 10-07-2013, 04:39 PM Thread Starter
Tyler980
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Quote:
Originally Posted by cruiser54 View Post
Keep it in drive. Get it into 4H. Stop. Put trans in N. Shift to 4L.
Okay, so I tried this... when I hit the stop spot for 4HI it didn't shift into 4HI, it wouldn't go to 4hi, till i brought it to the right, passed the stop, and where neutral is it was in 4 HI, then to neutral a little bit backwards from there... and 4LO was down further but locked into place towards the left... and when I put it back in 2HI from stop in 4LO it felt like one of my tires was spinning and the other one had no power... so i put back to 4hi then 2HI and it was fine again, but when I hit 4LO it had a terrible whining noise coming from it...
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post #13 of 21 Old 10-07-2013, 05:07 PM
cruiser54
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Adjust the linkage then.

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

www.cruiser54.com

My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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post #14 of 21 Old 10-07-2013, 05:14 PM Thread Starter
Tyler980
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Quote:
Originally Posted by cruiser54 View Post
Adjust the linkage then.
Alright.. was hoping it wouldn't come to that...
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post #15 of 21 Old 10-16-2013, 11:27 AM Thread Starter
Tyler980
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Okay, so I got under there, after putting it in 4LO... i can see the linkage, but I have NO IDEA on how to adjust it? I found two nuts and bolts holding part of the linkage to the body, and then I found a bolt that is on the tcase thats also attached to the linkage... Am I missing something or is it one of those? And how do I adjust it?
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