On my Dynasty, I dumped the OEM exhaust brake and replaced it with the PXRB from Pac Brake. By far, the BEST upgrade I ever did. The difference was night and day. Spend a few bucks and upgrade....you'll thank me afterwards.....Don't wait too long to apply the EB. Lots of folks wait until their speed is too great before applying the EB. This means the EB does not engage. If 50mph is your comfort zone, apply the EB near the top of the hill just as you start down. The tranny indicator should show 2,3 or 4 depending on how it's programmed...yes, it can be changed. This does not mean your tranny has shifted, it simply means when your speed comes down it will lock in at that gear. The allison will not let you overrev the engine. If you begin to exceed your comfort speed, STAB the brake pedal and release. Do it as often as you need to in order to bring your speed down to your comfort level again. I rarely used my service brakes after the upgrade to the PXRB. ...Dennis