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Old 04-16-2019, 07:32 AM   #1
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Rough Downshift

Tranny (3000) on 02 Monaco has developed a rough downshift into 4th gear when climbing grades. Approx 72000 miles

Has anyone experienced this? What to do?

Colin
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Old 04-16-2019, 07:42 AM   #2
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Hello - my coach also has a very, very rough 5th to 4th shift under full throttle conditions. All other shifts are perfect. I have Allison check it out and they say there is nothing wrong. This means that there are no codes. I have 131k miles on our 02 Monaco Windsor.

I hope someone can jump in here with a few ideas.

Alan
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Old 04-16-2019, 09:40 AM   #3
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Have you checked your fluid level in the tranny. With the 3000 you can check the levels with the selector pad. You probably already know this. My manual says the keypad is more accurate than trying to check the tranny fluid with the dipstick.
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Old 04-16-2019, 03:42 PM   #4
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I'm curious if you have ever changed the transmission fluid and, if so, what fluid did you use?
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Old 04-16-2019, 10:08 PM   #5
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Hello - fluid level is OK per the keypad and the fluid is Transynd changed twice since 35K miles (131K now).

Alan
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Old 04-17-2019, 10:11 AM   #6
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I'd start by having the Transmission Adaptive Pressures (TAPs) reset and see if it adapts in well. You will have some bad shifts as it adapts back in.
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Old 04-17-2019, 10:19 AM   #7
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I have a 4000MH. Started giving me rough shifts. Changed the speed sensor in the bellhousing and cured it.
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Old 04-17-2019, 06:42 PM   #8
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Hello - Allison reset what they called Fast Adapt. No improvement. I like the idea of the speed sensor but wouldn't this affect all shifts or throw a code ???

Alan
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Old 04-18-2019, 07:22 AM   #9
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Quote:
Originally Posted by Alan Roberts View Post
Hello - Allison reset what they called Fast Adapt. No improvement. I like the idea of the speed sensor but wouldn't this affect all shifts or throw a code ???

Alan
Maybe. There are many variables that go into a shift. An Allison service center can use Allison service tools and look at this shift and diagnose it.

Does engine speed flair off (like slipping the clutch) before it bangs on? Does it bang on fast? Is it so bad it shakes the camper or just a noticeable irritation?
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Old 04-19-2019, 06:34 AM   #10
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Bangs on fast and shakes the RV
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Old 04-19-2019, 08:34 AM   #11
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Same here - fast shift with a 'bang'. No flare.

Alan
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