Toolguy5 wrote:
Have a question.
I have a 3500 GMC diesel. My question I when in the mountain areas should I leave it in drive and use the exhaust brake, or put it in manual and shift gears when climbing and descending.
Never been in the Rockies.
tow haul mode, exhaust brake on and cruise on and it will hold the speed your set to. IMHO no reason to use manual mode. Go over the rockies quite often, seldom need to use the brakes with it.
other than a few trips on the interstate we usually are on secondary roads, and many have steeper grades and sharper turns than the interstate by a long shot. should not have any issues on virtually all roads.
BTW get a copy of the "Mountain West Directory" it give good info on most all mountain highways and passes with grades, length, turns etc.