what year and configuration? do you really mean it will "not engage" or it will not DIS-engage? can you push the pedal down? does the truck try to move when you crank it with the pedal down? are you sure you used all the correct parts for your application? examine your work carefully to see what you've installed incorrectly, maybe you put the throwout bearing in backwards - you need to elaborate on the problem

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