by hilljb » Mon Aug 01, 2016 7:36 pm
I basically can't do anything unless I'm in 4LO when I'm over about 12,500 feet or so offroad. If I'm going uphill, the air pressure along with my 3.42 gearing make for a horrible combination. So, I need 4LO to climb anything offroad. Going downhill is scarier, due to a high altitude + low RPM stall issue that I've been chasing down... and mostly fixed with a new camshaft position sensor. I think the truck has only stalled once this year at altitude.
A lot of people don't realize how thin the air is up there. At 14,275ft yesterday, my barometer was saying 580mbar, which is roughly 58% the pressure of sea level.