Exhaust Brake

[Joe917]

These trucks are full time 4X4, locking the central diff on snowy Icy roads changes the feel of the truck dramatically.

 

[mxpxer7]

Thanks Joe and Neil!

I was definitely becoming very nervous on some downhill segments.

 

[mxpxer7]

These trucks are full time 4X4, locking the central diff on snowy Icy roads changes the feel of the truck dramatically.

So I get that when you lock the rear diff both rear tires spin together with equal power (even if one loses traction).

What does the center diff do?

 

[Joe917]

Center diff splits the power 50 50 front and rear. Keep all diffs unlocked on dry asphalt. lock the center in snow and ice, and loose surfaces, mud, gravel etc.

 

[joeblack5]

Not sure about the need for an air cylinder shutting the IP of. The governor should shut off the fuel anyhow when you take the foot of the throttle. Only to give fuel again just above idle.
Unless you want yo use the exhaust brake below idle rpm there would be no use for that air cylinder .

Johan