Mike - GM has 3 groupings, light, medium, and heavy duty [really big], but there's only 2 variations in the sheet metal - "big truck" here means 1.5T and above, the light trucks [up to 1T] have 15-19.5" wheels and all the same size fenders, 1.5T and up use 20-22.5" wheels and have the larger fenders

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 & Rust-a-holics Unanimous parking lot