if you want an easy way to get better highway gearing, it's good
if it's a truck trans, it should be a dirct bolt in
look out for 'complete and works', including the electric bits like the solenoid
if you search "3 speed OD" you should be able to find lots here about folks using it and much discussion

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