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  #1  
Old July 31st, 2018, 07:49
Lawsonmahoney Lawsonmahoney is offline
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NP242 install question

After installing a lift on my 1988 XJ, instead of buy a new SYE, I got another NP242 from a Ď98 with the SYE already installed from another forum member.

Iíve installed the case, bolted up the shafts, changed the fluid. Put it in gear... nothing. It doesnít click like itís going into gear when I try to go from neutral to either reverse or drive. Under power itís like the TC is in neutral. When I try to put it in park it makes a light grinding noise so Iím leaving it in neutral.

I shifted the selector on the TC manually by hand to get it into what I believe is 2WD. Tried again with the same result. I then, from the cab, tried shifting into everything from part time to full time to neutral to lo. Nothing. I cannot for the life of me make it move.

Any thoughts? The videos and write ups I saw didnít make putting the TC back in to be a big deal. Just slide it in after youíve lined it up with the bolt holes and youíre good. Or so I thought.
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  #2  
Old July 31st, 2018, 07:58
RCP Phx RCP Phx is online now
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Re: NP242 install question

Did you change the input shaft gear? Yours is a 21 spline. the '98 is a 23 spline!
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  #3  
Old July 31st, 2018, 08:04
Heavyopp Heavyopp is offline
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Re: NP242 install question

Quote:
Originally Posted by RCP Phx View Post
Did you change the input shaft gear? Yours is a 21 spline. the '98 is a 23 spline!
if this is true then how did they even fit together?

Unless they didn't...
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  #4  
Old July 31st, 2018, 08:09
Lawsonmahoney Lawsonmahoney is offline
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Re: NP242 install question

That isn’t something I changed. From what I’d read, retrofitting the case was limited to the speedo cable and 4wd selector light.

Everything fitted together smoothly. No forcing at all. So that’s a bit of a surprise. And an obvious bummer.
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  #5  
Old July 31st, 2018, 08:12
RCP Phx RCP Phx is online now
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Re: NP242 install question

Oh it will bolt together! It wouldn't if you tried to stick a 21 spline case on a 23 spline shaft!
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  #6  
Old July 31st, 2018, 08:32
RCP Phx RCP Phx is online now
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Re: NP242 install question

Be aware of the fact that your '88 input gear will not work in a '98 case.
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  #7  
Old July 31st, 2018, 08:51
Lawsonmahoney Lawsonmahoney is offline
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Re: NP242 install question

Thanks for the help RCP. Why won’t my 88 work? BleepingJeep did a video where he did the swap for a 231. He had to use the front of the old case because of bearing size but other than that everything bolted up Ok.
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  #8  
Old July 31st, 2018, 09:01
RCP Phx RCP Phx is online now
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Re: NP242 install question

It's the cut of the gear.
https://www.novak-adapt.com/knowledg...g-input-gears/
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  #9  
Old August 1st, 2018, 05:35
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cruiser54 cruiser54 is offline
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Re: NP242 install question

I'm guessing the 21 spline output shaft of the trans is spinning inside the 23 spline female transfer case input.
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  #10  
Old August 6th, 2018, 12:17
Lawsonmahoney Lawsonmahoney is offline
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Re: NP242 install question

Novak conversions no longer sells the 21 spline with the late model cut. Does anybody have any idea where you can get an input shaft that you can use to make a late model 242 work with a early model 21 spline trans. All I can think of is either swapping the whole trans with a late model one or just trying to get rid of this late model TC and starting over.
What about swapping the planetary gears from my old TC and using the input shaft from that as well? I’m assuming that’s just not possible..?
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  #11  
Old August 6th, 2018, 14:15
RCP Phx RCP Phx is online now
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Re: NP242 install question

While swapping the planetaries "is" possible, not without a machine shop!
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  #12  
Old August 9th, 2018, 19:30
lawsoncl lawsoncl is offline
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Re: NP242 install question

Quote:
Originally Posted by Lawsonmahoney View Post
All I can think of is either swapping the whole trans with a late model one

Going newer than a 97 means your trans computer won't work. 97 involves a bit of cutting and splicing of connectors.



"Everything you ever wanted to know about the AW4"

https://www.naxja.org/forum/showthread.php?t=1053970
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