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Old 04-19-2019, 08:20 PM   #1
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Confusing Adaptive Shifts Procedure

I'm new to driving a Diesel Pusher so maybe what I think is abnormal might be perfectly normal. The tranny seems to up shift too soon and downshift too late. From a dead stop, normal acceleration from a traffic light, it is in 6th gear by the time it reaches 45mph. Ascending moderate interstate uphill grades it doesn't seem to downshift unless I go Wide Open throttle.

So, I started reading about The Allison Adaptive Shifts learning procedure and I say I find it quite confusing. Maybe it's the unfamiliar terminology. It says to accelerate wide open throttle to 1-2 then decelerate 2-1, then do it again 2-3 and then 3-2 and so forth and so on. Its too confusing and then where would one find a place to perform all those steps.

Can someone direct me to a less complicated version?

My rig is a 40' 2006 Itasca Horizon with Allison 3000 6 speed, Cummins 8.9 Turbo 400, on a Freightliner evolution chassis.

Thanks
Jerry
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Old 04-20-2019, 09:22 PM   #2
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First off, are you using Eco-mode/ light on or off? The Allison will up-shift sooner in Eco-mode compared to standard mode. The TCM attempts to coordinate with the ECM to keep the engine as close to maximum torque values as possible by using a different shift pattern.
If you wish to start from scratch with shifting, simply disconnect the negative battery cables for a few hours; reconnect them and drive as usual. The TCM will "learn" your driving style.
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Old 04-21-2019, 04:48 PM   #3
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I'm running in normal mode. No light. I also replaced chassis batteries last week so there was no chassis power for a few hours. The TCM must have rest and now the tranny is learning again.
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Old 04-22-2019, 08:45 AM   #4
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Adaptive has to do with the quality of the shifts, not when they occur.
What you are describing is an economy shift schedule.
Contrary to popular belief, the adaptive values and shift schedule are stored in non-volatile memory and doesn't get lost if the batteries are disconnected.
Push the mode button before you drive next time and see if the shift points change. You may or may not have a different shift schedule in secondary mode.
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