if I had to guess, I bet it is for a shift, or a special ordered truck, and that was the letter designated by the shift for that piticular truck to be followed down the line.....
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Seeing as there are four 77 D150 440 truck owners here it would be cool to compare the MDH between the trucks.
Mine says 031821L x Not sure what the L or X are for?
Not sure what the L stands for. Will have to do some checking on that.
Dinuba, California, Home of the PALOMINO ranch and 440 truck farm, where dodge trucks have a home. Have Four 1979 dodge PALOMINO trucks now.