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Most brakes now are using the variable vane turbo instead of an add on like the pacbrake.

Carl, that makes the most sense. I drove a Mitsubishi that would turn the brake off, downshift, then turn the brake back on. That was very smooth, and effective.

Is that what is in the transmission in the new Ford's?

Ford has some sort of high pressure compressed air device they were experimenting with 15 or 20 years ago. It would give a bit of a push on take off.

So how does the transmission provide more braking than an exhaust brake?

My point is that there is only so much braking available from the engine. An exhaust or engine brake increases that by a lot. Unless it's a Duramax, then you'd have better luck dragging your feet.

That is no different than being in gear with a manual trans. Wouldn't a brake be even better on top of that?

How does an automatic obviate the need for an exhaust brake?

Ford does the same thing, although I'm not sure it's an actual exhaust brake.

Oops. There's an extra page of replies in the middle there that I didn't see. Kindly disregard my rambling.:lol:

You guys both beat me to it. Intake hose or exhaust brake. Most likely hose fitting. Our IH 4900 wasn't running very well a couple of years ago. Changed fuel filters, no change. I finally found a clamp off the intake hose going to the intercooler. It was like a new truck after that.