Ok my question is do i have a NP 241 or NP 231. I thought it was a NP 231, but now that i look at pictures of it, the fill and drain plugs are different. I have a 97 4x4 with ax-15 5 speed. My fill and drain plugs are the allen type. I have a slip yoke. Is this a 241 or 231?

 

There are some that are different, I bought a transfer case, when it came in the fill plugs where the type you remove them w/ a socket yet the one I originally had used allen wrench plugs. They can be either or, the 231 does use the slip yoke. Best way to find out which one you have if you're ordering parts or a new one is to give them the model number, you can find that on the tag the transfer case has.

 

thanks