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Old 04-24-2012, 02:45 PM   #1
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Transmission hard shifing

I have a 3000MH Allison transmission. I changed the oil and filters per factory specs. The transmission now slams into 4th gear when downshifting from almost any speed. All other shifts are smooth up and down.
I am located in the Houston, TX area. Any and all recommendations are appreciated including where to take it for trustworthy service. Allison has recommended Stewart and Stevenson (where I purchsed the filter and fluid by the way).

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Old 04-24-2012, 03:22 PM   #2
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Take it to an Allison certified shop. They can download any codes which may have been set.

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Old 04-24-2012, 03:27 PM   #3
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Correct filters?
Correct fluid level?
Exhaust or Jake brake on?
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
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Old 04-24-2012, 08:44 PM   #4
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I got the filter kit and fluid as recommend by Allison.
The exhaust brake drops the transmission to 4th gear with a bang. That is the problem.
I reviewed the codes with Allison that I could see from the shifter. No help there.
Their recommendation was take it in.
I am not looking forward to this.
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Old 04-25-2012, 02:59 AM   #5
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does it shift hard when up shifting from third.you can take it to an allison dealer and they can put it on {fast adapt] which makes it relearn the shift pattern. But saying that nothing should of changed from just changing oil/filters. when you took filters down did you notice any metal in filters.
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Old 04-25-2012, 06:32 AM   #6
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Hard downshifts are normal for a couple hundred miles after a fluid/filter change. Your allison transmission will "relearn" how to downshift and make the required adjustments all by itself.
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Old 04-25-2012, 08:59 AM   #7
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The oil and filters were grit free. No metal shavings on the drain plug. Everything looked good.
From time to time I got a rough shift into 4th gear in the past but not as hard as it is shifting now.

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