1st C = 41-46
2nd C = conventional cab
404 is the WB [179" WB] and series

all trucks 1.5T and above are the same basic frame with variations in springs, tires, frame rail gusset plates for the GVW rating .... 15,000 could be a 2 or 2.5T but also a 1.5T, the important part is your rated GVW

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics