the frame numbers start in 55 for Chevy, and I've heard GMC started a bit earlier - any TF series I've seen are stamped on the top web of the drivers frame rail just behind the steering box, and the frame numbers don\'t include the leading model designation , cuz that's not determined when the basic frame is assembled .... which is what makes the number on the door plate a "vin" number rather than just a "serial number"

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