My NP241 came off an '89 Suburban (pass. drop). It's packed away right now, so i don't remember what the spline count is...27? 30? Anyone know if this will work with an NV4500? Searched around the other day, and saw a couple of pics. Looked like the same round six bolt pattern. need an adapter like the one on the 700R4? Coupler on transfer no worky? What transfer cases were offered behind the NV on GM trucks? Thanks.