I have a 74 Bronco Chassis with a 2001 GMC Sierra 1500 5.3L complete motor (with computer and all) matched up to a rebuilt (beefier) 2001 GMC 4L60E tranny. I have a rebuilt Dana 20 I'd like to use for the transfer case. Its' attached to an Advance Adapter to a rebuilt mid 90's NV-4500 tranny. Long story short - switched to an Automatic. What Adapter do I need to fit between the 01 4L60E and the DANA 20 transfer case? Any advise would be appreciative.