NP231 Shifting OUT of 4 Lo VERY Difficult - JeepForum.com
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Unread 04-02-2008, 01:28 PM   #1
Jim93YJ
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NP231 Shifting OUT of 4 Lo VERY Difficult

Does anyone else have a hard time shifting out of 4Lo? If so is there a fix or linkage adjustment that could be made??

No problems shifting into 4Lo or in or out of any other gears

Thanks

Jim

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93YJ 4.8L Vortec,AX15,Atlas 4.3:1, 4.56 Gears, Dana 30 w/ Posi-lok,Dana 44 Rear w/ Ox Locker + 99 Explorer Disk Brakes,Tom Woods D. Shafts,1" Body, 2.5" ED RE Lift, 33" BFG KM2 T/A's with MT Classic II Wheels, Herculined Inside, Electric Fan, 20 Gal Tank Conversion,Tuffy Center Console,Warn Front Bumper, Rockhard 4X4 Rear Bumper w/ Tire Carrier,Bushwacker Extended Flat Fender Flares,AMSoil/Redline In Everything and the List Goes On....

AND...

88YJ 4.2L: Interior and mechanical overhaul including engine replacement, nutter bypass, Weber 34 Carb, and work on a whole bunch of other things to get it back to fine running condition without the emissions control...evap cannister kept functional as well as PCV system, and manifold heater.
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Unread 04-02-2008, 03:54 PM   #2
sitdwnandhngon
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is it always hard to do? can you do it at full stop in neutral, or rolling slightly?
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Unread 04-03-2008, 08:59 AM   #3
Jim93YJ
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Shifting in 4 Lo is easy but to shift out I have to be pushing incredibly hard on the stick and rolling slighlty
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93YJ 4.8L Vortec,AX15,Atlas 4.3:1, 4.56 Gears, Dana 30 w/ Posi-lok,Dana 44 Rear w/ Ox Locker + 99 Explorer Disk Brakes,Tom Woods D. Shafts,1" Body, 2.5" ED RE Lift, 33" BFG KM2 T/A's with MT Classic II Wheels, Herculined Inside, Electric Fan, 20 Gal Tank Conversion,Tuffy Center Console,Warn Front Bumper, Rockhard 4X4 Rear Bumper w/ Tire Carrier,Bushwacker Extended Flat Fender Flares,AMSoil/Redline In Everything and the List Goes On....

AND...

88YJ 4.2L: Interior and mechanical overhaul including engine replacement, nutter bypass, Weber 34 Carb, and work on a whole bunch of other things to get it back to fine running condition without the emissions control...evap cannister kept functional as well as PCV system, and manifold heater.
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Unread 04-03-2008, 10:11 AM   #4
Alabamaranger
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Just had to tear into mine. This site help me a lot to see what going on inside.

http://www.opiebennett.com/images/Je...2015/np231.htm

I would take the linkage off and see if it's still hard to shift it by hand. If it is, than you know something is causing it inside. Pricing parts out, it might be cheaper to get another tc for a spare.
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Unread 04-03-2008, 10:13 AM   #5
Alabamaranger
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Mine is equal pressure when going from L to H and H to L.
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Unread 04-03-2008, 01:36 PM   #6
sitdwnandhngon
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its possible your linkage needs adjusting however if it just suddenly began doing it its probably something internal, Tcases are not my cup of tea, i just go the the boneyard and get a new one if mine breaks, like Alabamaranger said, take it off and see if you can move the lever with your hand, with your transmission in neutral and the tires blocked you should be able to go through all 4 positions with little effort. if you can then adjust your linkage.
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Quote:
Originally Posted by northjeep View Post
4.2 has 0.2 more!
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Unread 04-03-2008, 02:08 PM   #7
Alabamaranger
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1990 YJ Wrangler 
 
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If it's inside, it's easy to pull the rear half of the case off while still in the Jeep. Took about 20 minutes to take apart.
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Unread 04-03-2008, 04:23 PM   #8
Jim93YJ
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Thanks guys for the input....I did not realize it shoud be easy enough to shift the transfer case without the mechanical advantage of the linkage. Hopefully that is all it is.
__________________
93YJ 4.8L Vortec,AX15,Atlas 4.3:1, 4.56 Gears, Dana 30 w/ Posi-lok,Dana 44 Rear w/ Ox Locker + 99 Explorer Disk Brakes,Tom Woods D. Shafts,1" Body, 2.5" ED RE Lift, 33" BFG KM2 T/A's with MT Classic II Wheels, Herculined Inside, Electric Fan, 20 Gal Tank Conversion,Tuffy Center Console,Warn Front Bumper, Rockhard 4X4 Rear Bumper w/ Tire Carrier,Bushwacker Extended Flat Fender Flares,AMSoil/Redline In Everything and the List Goes On....

AND...

88YJ 4.2L: Interior and mechanical overhaul including engine replacement, nutter bypass, Weber 34 Carb, and work on a whole bunch of other things to get it back to fine running condition without the emissions control...evap cannister kept functional as well as PCV system, and manifold heater.
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