Hmmm... I see one of those "rare' metric Ton badges every day on my tailgate... :nanner:
But OP.. its in the VIN number.
1986 F,G,H,J In position 8 is metric ton.
Renix era F,R,U In postion 8 is metric ton. But a 1 in that position is custom ordered so that also could be a metric ton.
Chrysler era.. don't know for sure