Turtle n Peeps wrote:
bbaker2001 wrote:
So running in TH will change gears automatically and downshift for me?
My gasser ran about 3500 going uphill. So 2000 for a diesel is not a problem going uphill. I dont think I could get it to 2000 on straight ground.
When cruising at 60 it is so quiet, I dont want to lug if, but don't know how to tell
Yes it will do all of that and then some. All modern engine auto tranny combo's will not lug. It's impossible. It knows how much your pulling and what kind of strain is on the engine. It's all programed into the computer. You're along for the ride; just enjoy it.
One more time. Put it into drive; put your TH on and drive.
As tranzam said, in certain conditions they will lug. When I am towing in the Texas hill country, which is a lot of constant sharp up and down hills, the engine will lug going up some hills. My truck will automatically apply the exhaust brake because it is gaining too much speed going down a hill which will slow down the turbo compressor. If there is an incline immediately after this, then the engine will lug because there is no boost and the trans will not know what to do for a short time until it downshifts. Even my brother 2012 F350 will do this and I would suspect that a Duramax would as well in the same conditions. The only way I have found to combat this when my truck was stock was to lock it into certain gears. After I custom tuned my truck's shift points, this was not an issue.
As far as the OP's rpm question. Lower rpm+high load= high EGT's which means greater chance of engine/turbo damage. Higher rpms with load will generally have less EGT's. I would recommend sooner oil change intervals if you at high rpms for long periods or on a normal basis though.
