Glad to see the interest, the Early Broncos(66-77) were about 4000lbs so I think the motor will be just right. The question I haven't asked yet is does the transmission have a removable tailstock? if so I was thinking about taking that off build a shaft that will accept the D-20 transfer case adapt the two together there. Advance adapters makes adapters for the 4bt cummins, but as far as I know no one has ever done this. I like how much quieter the Mercedes is than the 4bt.

Tim