you won't find it fisher, all you can do is collect as many date codes off parts as you can to get an 'average', and guess by the sequence number of the vin, early in the model year or late

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