Here is a TH400 NP203 for sale. The tranny was rebuilt and running about a year ago, it has a deep pan on it and includes the torque convertor. One bellhousing bolt hole has been busted ~1/2 off or more so check the one pic out. This is a great combo for parts for your doubler if nothing else. I'll consider parting it out if whatever offers I get aren't adequate. Sometimes these sell better in parts because it's easier to ship. If you buy it whole I'm asking $400
Local pickup/delivery preferred obviously but I can ship this Forward Air.
Like all this but you want a Buick or AMC TH400 case to stuff the parts in? I have both available.