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Forgot about bolt pattern, they only affect the 203 and 205, the 208 only came in a round pattern. Splines are different as well, being a 75 you likely have a 10 spline. Advance adapters may make an adapter to mount the nv3500 to the current 205Then for the np208 transfer there are 2 splines, a 27 and 32 (I don't think it's 31, but I could be wrong and roundhouse correct) 32 spline came behind the th400 and late sm465, 27 behind the 700r4. Not sure on th350 or the overdrive manual(rare)Sent from my SM-S920L using Tapatalk