[CrashEd]

The divorced transfer case is separated form the trany by a short shaft. When there bolted together there called married. The divorced transfer case wouldn't work in your blazer it would make the rear drive shaft to short and to much of a angal.
The old trany transfer cases had the figure 8 adapters the newer ones are the round adapters which will work fine if you get the set witch would be trany adapter and case.
The TH400 took a 32 spline 205 case.
The Th350 took a 27 spline 205 case.
The sm465 took a 10 spline 205 case.
These are the figure 8 pattern up to like the 80s models
The new ones run the round adapters i know the newer sm465s took the 32 spline case along with the TH 400 trans not sure on the TH350.
I would stay away from the 203 transfer cases if you want a newer unit get the 208 case with matching trans.
If you get the older say TH350,adapter and 205 case then you should be able to find a set of shafts for that set up just measure the distance from yoke to yoke on the front and rear then you can use that distance to search the right shafts out just make sure you have the slip joint in the middle of its slide to measure it.
Hope my rambling helps.
Ed