Quote:
Originally Posted by Lost and Found 2022
I am happy with it so far. I am looking into the Cummins uprate and transmission shift schedule change that has been talked about by other owners on the forum.
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I had both upgrades, huge difference. But my transmission came (mistakenly) programmed with an "ultra economy" shift schedule as "primary". Our transmission control modules can hold two shift programs but Freightliner/Jayco provided no way to switch between them. It has to be done by hooking the rig up and changing the shift schedule. A number of folks had Allison change the performance shift schedule to "primary". I (and a few others) had a custom performance schedule uploaded provided by Allison. In my case it made my rig perform like a totally different animal. And the extra power provided by a Cummins horsepower/torque uprate was icing on the cake.
I used to be in the line of semi trucks slogging up the long interstate grades with my hazard flashers on. Now I am passing all those trucks. Obviously there are some very long and/or steep hills where I'm slowed below the speed limit, but nowhere near like before!
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