jared,
Also, is the 85' setup Carburated or Fuel Injected? If it is carburated, then it is a G54 transmission that uses a forward shifting transfercase, but if it is a fuel injected setup, then its a W56 transmission that uses a top shifting transfercase...
Now my point is that if its a G54 transmission (carburated 85) then the transfercase shift handle will mount in a different location then your 82 t/case shifter location - so you may have to modify your floor board, or if you want to use your 82 t/case, then you will have to make a plug for the forward-shift style t/case shifter base on the back of the transmission. But now if you use a 82 t/case behind a 85 transmission (any 1979-1993 t/case behind any 1984+ trans) then be sure to use the gasket from the 82 t/case as the 84+ gaskets are taller and will only seal the t/case by about 1/8th inch at the top!!
WT has the most important point with the aluminum (1984+) transmission being 4-inches longer which will result in relocating the crossmember and adjusting both your drivelines......
Everything else will bolt right up. Splines, bolt patterns, reverse shift light switch, ect..
Regards,
BigMike