Need Help On Tranny Conversion

[gator2511]

I bought a th400, Gear Vendors O.D., and was buying the adapter from Advance Adapters to connect the th400 to the 205 transfer case when they said it couldn't be done! My 205 transfer case is made for a four speed standard tranny. They say nobody has an adapter for that. I'm told I'll have to find a rebuildable 205 transfer case made to fit an automatic or convert to a stick shift. Have any of you guys run into this before? I'd really like to go with the th400 so I can tow my travel trailer with it. Don't know what to do now! The truck is a 72 short wheel base fleetside 1/2 ton.