Hey TJers,
I reassembled my NP231 transfer case over the weekend for my diesel swapped TJ Wrangler project. I had to change the input shaft from a 23-spline input to a 31-spline input so I could mate it with my Ford 6r80 6-speed automatic transmission. While I had the transfer case apart I added the Teraflex 2-Low kit #2204000 and then reinstalled the JB Conversions Super Short SYE kit I had installed on the transfer case previously as well.
I decided to reassemble my transfer case with the front half of the case bolted to my transmission. This made the entire process much easier than I thought it would have and it saved me from having to lift the built transfer case onto the transmission.
Since I’m no longer running the doubler, I installed a Teraflex 2 Low kit onto my NP231, it’s a mode range that I use often where I live while off roading in the woods, I don’t need 4 wheel drive but slowing down my rig is really useful.
The process for installing the Teraflex 2 low kit is very straight forward, you just need to make sure you reuse the factory o-ring and bushing that seals to the Shift Selector and remember to remove and re-install the indent ball and spring.
Another thing to keep in mind is a little bit of gasket maker, I used Permatex, goes a long way when you go to seal the two case halves of the NP231 transfer case. Teraflex says to use no bigger than a 3/16 bead of gasket maker. I like to apply it with my fingers around the outer most edge of the lip of the case to reduce the change of the oil pump getting clogged with Permatex.
The most difficult part of the entire reassembly though was torquing the rear output yoke nut to 200ft/lbs. This is required to lock the tone ring into place for the JB Conversions Super Short SYE kit. I ended up bracing myself against the frame rail of my TJ to have the leverage to get the nut to torque to 200 ft/lbs.
Here is the video if you want to watch it:
Thanks
Grant
I reassembled my NP231 transfer case over the weekend for my diesel swapped TJ Wrangler project. I had to change the input shaft from a 23-spline input to a 31-spline input so I could mate it with my Ford 6r80 6-speed automatic transmission. While I had the transfer case apart I added the Teraflex 2-Low kit #2204000 and then reinstalled the JB Conversions Super Short SYE kit I had installed on the transfer case previously as well.
I decided to reassemble my transfer case with the front half of the case bolted to my transmission. This made the entire process much easier than I thought it would have and it saved me from having to lift the built transfer case onto the transmission.
Since I’m no longer running the doubler, I installed a Teraflex 2 Low kit onto my NP231, it’s a mode range that I use often where I live while off roading in the woods, I don’t need 4 wheel drive but slowing down my rig is really useful.
The process for installing the Teraflex 2 low kit is very straight forward, you just need to make sure you reuse the factory o-ring and bushing that seals to the Shift Selector and remember to remove and re-install the indent ball and spring.
Another thing to keep in mind is a little bit of gasket maker, I used Permatex, goes a long way when you go to seal the two case halves of the NP231 transfer case. Teraflex says to use no bigger than a 3/16 bead of gasket maker. I like to apply it with my fingers around the outer most edge of the lip of the case to reduce the change of the oil pump getting clogged with Permatex.
The most difficult part of the entire reassembly though was torquing the rear output yoke nut to 200ft/lbs. This is required to lock the tone ring into place for the JB Conversions Super Short SYE kit. I ended up bracing myself against the frame rail of my TJ to have the leverage to get the nut to torque to 200 ft/lbs.
Here is the video if you want to watch it:
Thanks
Grant