Ronmar
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Guess we’ll have to agree to disagree. On an interstate in the mountains I want to be able to use the exhaust brake to manage speed on the down grades and in a truck easily capable of moving along with traffic, I don’t want to be in the slow lane with my flashers on going 35mph. I can always manually shift down into third when conditions warrant it, but I can’t prevent the aggressive downshifts to 3rd as currently programmed when I don’t want or need that.Agree with Ron. Wouldn't mess with the Allison programming. There's no reason and redline under decel with no fueling is hurting nothing. Higher RPM increases hydrodynamic film strength in the main and rod bearings and with no fuel there's also no load. There's no benefit to not using the lowest (numerical) gear that results in maximum engine braking within the RPM envelope of the engine - and the closer to redline the better as that results in higher oil pressure and film strength as well and in a zero-fuel condition so there's no trade-off - the result is simply less service brake wear with zero drawbacks.
But is it an interstate with a 75mph speed limit where you are driving 60-65mph? I live in the hills as well, every direction from my house is downhill on steep winding roads. Speed limits range from 25 to 40mph and on the hills that are 40mph, 3rd gear is lower than I want to be in in most cases. In 4th I could comfortably coast down the hill with the exhaust break on.Wait till you have more weight. That will likely make it less harsh. I don't notice anything untoward with the downshifting down grades. Have a steep one from the grocery store to my house that I travel regularly.![]()