[Jared at Pelican Parts]

my dad's 95 GMC 3500 ex L.A.F.D. 6.2L diesel has a engine compression release brake setup thats works very well, but I dont know if this was stock or added for the fire department. Not that you really need it. If you downshift into second from third, and let the clutch out just slowly, it will throw you forward. Truck weighs 4 tons, so i guess the extra braking is a good thing

I would just start calling heavy industry truck fabricators (cabs, beds, etc..) in the area and see if there is something available. I would imagine there all kinds of options for a GM truck. If anything, there have to be bigger GM calipers that bolt on.

Like the idea of a chute. Think that would be awesome to dump the compression and fire the chute when slowing, although the truck will only hit 75MPH.