I have one on my 99. It works great. It's not as powerful as one of the aftermarket butterfly type systems, but I find it works on 7% grades with no problem with my almost 11,000lb 5th wheel. I can come down a long 7% grade and hold at about 55mph with OD off. If I need to go slower eg for sharp bends, I drop the speed to about 45 mph and select 2nd.
Mine has an on/off switch and it has a relay wired into the cruise control that automatically disengages cruise if the exhaust brake is activated. When activated, it engages about 3 seconds after I lift off the throttle.
I have the torquelock style option on my tranny too.
Mine is called Towsysems2000. The web site is no longer available (
www.towsystems2000.com) The last phone number I have is 1-877-293-7244 or 503-784-7505 and email is
performanceparts@onewest.net.