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dose anyone know if the (400)in my 1984 cucv blazer will mate up to a np 203 OR NP 205 Transfer case without an adapter kit. in sick of this leakin 208 pissin allover the place.
check out Advance Adaptors web site, they have all the dirt on this, and no, even a 32-spine 203 or 205 won't just bolt up, and you must consider the cost of modifying both driveshafts, not to mention the shifter and crossmember mods. I would just fix the 208 or replace it with another one and keep it's 2.61 low range (vs. 1.96 or 2.01).
You can use a 32 spline NP203 but you will need to re-drill the front face to the round pattern. Which will require the whole case to be taken apart drilled and put back together. If you are able to find a round pattern NP205 you will have to swap in a short 32 spline input to allow it to bolt up. You also wont have a pivot point for your shifter on the 208 adaptor. So either of them will fit but not a direct bolt in.