I have a BB 727 car trans and a SB 727 4x4 trans (for 203). Here's the question, How much trouble is it to remove the tailshaft and rear adaptor housing from the SB 4x4 trans, and put it on the BB trans? Do I need to disassemble the WHOLE trans? I'd like to combine the two and make a spare trans for my 440 4x4. Thanks for any help!