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Old October 14th, 2013, 03:09 AM   #1
celrod77
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Will my SYE from NP231J work on NP231C

Alright guys and gals. I am in the process of converting my Jeep YJ over to a Small Block Chevy. I currently have a NP231J transfer case behind my AX15 with a Slip Yoke Eliminator kit. This is my plan and also where I need your help to make sure it will work. I am looking into purchasing a 700r4 with a NP231C transfer case from a 1990 S-10 Blazer with a 4.3.

I know that the 700r4 will bolt to my small block without issues. My question is will my Slip Yoke Eliminator from my NP231J work on the 231C?

Trying to do this conversion without the added expense of purchasing any adapters. Also, if there are any obstacles you have expierenced doing this type of conversion I would appreciate your advice.

Thanks in advance.
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Old October 14th, 2013, 05:56 AM   #2
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Yes in fact, it will. I did that a couple years ago with my small block XJ.
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Old October 14th, 2013, 06:19 AM   #3
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Agree with above. If I remember right from when I did it, the C had electronic speedo and the J had mechanical though.

As for your swap, the 700r4 isn't very durable but you probably already know that. You'll also need a conversion radiator. Make sure you add a trans cooler rather than use the cooler in the radiator. Best is to get a cooler with it's own fan so you can get trans cooling at low speed operation. Make sure the distributor is in the engine when you are placing the motor mounts and make sure you can get the cap off.
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Old October 14th, 2013, 08:47 AM   #4
celrod77
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Thanks guys. Appreciate all the advise!
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Old October 15th, 2013, 10:26 PM   #5
celrod77
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When putting the SYE off of my 231J on to the 231C is there anything special that needs to be done? Do I have to use any of the parts from the 231J on the 231C to make the SYE kit work?

Appreciate all your input on this.
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Old October 16th, 2013, 06:11 AM   #6
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There might be 2 thin bearings on the S-10 main gear that would need to come off for the new shaft to go on. Some have them, some don't. Other than that, put the shifter in 4 low and pull it apart.
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Old October 16th, 2013, 06:45 AM   #7
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http://www.greatlakes4x4.com/showthread.php?t=269457

well look what we have here.
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Old October 16th, 2013, 06:47 AM   #8
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Quote:
Originally Posted by Lousypirate View Post
Rong. That is a push button 233.
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Old October 16th, 2013, 06:56 AM   #9
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Quote:
Originally Posted by jbsjunk View Post
Rong. That is a push button 233.
dangit. 231/233... too close in #
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Old October 16th, 2013, 07:44 AM   #10
BigBlockBlazer
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If you know the manufacturer of you SYE download the instructions and go from there. The difference of the two installs will be the main shaft bearing delete on the C as mentioned above.
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Old October 16th, 2013, 07:47 AM   #11
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JB conversions has by far the best kit at the best price with their proprietary high clearance CV yoke. Here is their basic instruction page.

http://www.jbconversions.com/product...1j_std_sye.php
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