4 speed swap to 700r4 with 208 transfercase

[dog84chevy]

I know that I need the adapter what about drivelines and crossmember mounting locations are they the same does anyone know? I have a 84 3/4 ton with 383 stroker

[Snuke87chevy]

The crossmember has to be moved.

[dog84chevy]

ANY OTHER SPECIFICS THAT I NEED TO KNOW?  CAN YOU PUT A 32 SPLINE OUTPUT SHAFT IN A 700R4. LIKE THE KIND IN A TH400.

[dog84chevy]

just to add a update to the swap.  You do not have to move the crossmember if you use the correct adapter.  I used one out of blazer and the crossmember went back into the same holes.  I do have to lengthen both drivelines but only 2 inches.  They work ok but, I get some vibration at higher speeds.  
 If you are changing out a Th400 or Sm465 with a 32spline out put shaft ADVANCE ADAPTERS makes a new 32spline shaft to work in a 700r4.$ 234.00