You only want to use it with the clutch depressed and the truck not moving. It literally pushes the piston rod of an air cylinder at the face (outer edge) of the PTO gear, the plunger is machined to match the OD of the gear, so it does not grab, just creates friction and slows and stops the shafts.
I wish I had taken a picture of it in pieces before I installed it, it is very simple, whole thing is 3 pieces, an o-ring, and a gasket.
I needed one for the ford I had, and looked and looked, finally had to order one from the junk yard, they called around and found one, and I paid for it, a fair price, but it was not cheap. Then a few months later I see several at different places..
If I ever had the transmission out of the truck It would have gone back together with a pull type clutch and clutch brake, a better setup to start with.
Grigg
