aww I cant believe you said that Jared =(. Nice 231 Transfer case.. Did you get the floor shifter too ? They are hard to come by on 2nd gens .

 

lol first gens didn't have the Z so I'm very biased :P

the tcase is from a first gen, and it did come with a floor shifter. I anticipate having some fun trying to make it work but that's what this truck is all about

 

Any things possible... I Was going to swap my 233 to a 231 but my 233 is a manual now

 

Yeah, it'll probably have to be a hybrid of my 233 and this 231. My research is telling me the splines on this one are wrong.

 

The NP233C in my '96 has the same spline as my doner NP231C from a '94 Blazer. 27 spline IIR.

 

yea I dont think they are different either

 

from what I've found, they changed from one spline count to another. I don't remember what year that happend, like 92 or 93 I think. This one is from an 89.

edit: ugh.. I can't find where I found that now. I counted and this one is a 27 spline.... guess I have more searching to do lol

 

I found a lot of misinformation in regards to the input shafts. All I've seen behind a NP231C and 233C have been 27, but that could be just coincidence.

 

I think I'll just have to take my driveshaft out and look at what's there. A thread on ZR2USA said older tcases had 26 spline and newer had 17 spline so who knows.

 

Is it the rear slip yoke spline you are talking about, or the front CV stub? The rear output is 32 spline if I recall.
The front on NP231s are 26 spline, the same as a Dana 44 axle and D300 t/c. In or around '95 they switched to the CV front driveshaft on most of the GM Np233 cases, and it has the smaller square cut spline that you can't get a yoke for.

I assumed you meant the input spline, sorry 'bout that...