Hi,

I say with high assurance, yes. I have a '84 expedition and it matches in the following ways:

1) Pump boss on headtube - check
2) Triple bottle bosses - check
3) Lowrider bosses, same style (should be an m5 bolt) - check
4) Chainstay and Seatstay bridge reinforcements - check
5) Canti bosses same single hole style - check
6) Rear fender bosses in same location - check
7) vertical dropouts, rear derailleur cable stop - check
8) Rear rack bosses, same location - check
9) downtube shifter bosses - check
10) fender bosses, same number and location - check

Mine differs from this one in the following ways:

1) Dynamo wiring: mine has an extra brazed collar on the headtube-downtube lug hole, and the exit wiring has a hole in a different location
2) mine has rear brake guides on the top of the toptube rather than the side.

The lowrider bosses, rear rack boss location, and vertical dropouts certainly make me think that it is.