partial vin numbers were stamped on the top of the drivers side frame rail starting with the 2nd series 55's .... no one has come up with any GM documentation, but it's been discussed here a number of times
"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
