welcome to the garage Windy1 .... see the tech tips, and check out the GM info pack for 42 & 46 [none put out for 45] - and there's lots of other info available at the old Chevy manuals site .... as near as you'll find about "where it came from" will be the plant that produced it, if you have the actual vin, which doesn't show on that tag

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