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Old 10-11-2017, 02:09 PM   #1
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Harsh Transmission Shift Question

We just got done with a 6,000 summer trip. I noticed that every once in a while, the transmission shifts pretty harshly. It almost feels like there is a broken motor mount and the drive train in jumping. That is probably an exaggeration but the feeling is similar to that.

Here are a few observations:

I mostly notice it when I am hard accelerating. e.g. getting on to a highway or going up and down hills.

The problem did not get worse from the start of the trip to the end.

It happens in all gears but it is most noticeable going from 4th to 5th and 5th to 6th.

It is much more noticeable when the engine brake is in high and you go from breaking to acceleration.

Is this normal operation or am I looking at a large repair bill?

Thanks
B
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Old 10-11-2017, 02:32 PM   #2
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Have you tried this without the engine brake on. It sounds as if you leave it on all the time. When you take your foot off the accelerator not only will the brake come on but it will also try to shift down to the preselected gear (usually 2nd.) Any of this could cause you to feel a kick. Do a test run without the engine brake on and also without cruise turned on and see if you still notice the problem.
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Old 10-11-2017, 03:05 PM   #3
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Quote:
Originally Posted by Algoma View Post
Have you tried this without the engine brake on. It sounds as if you leave it on all the time. When you take your foot off the accelerator not only will the brake come on but it will also try to shift down to the preselected gear (usually 2nd.) Any of this could cause you to feel a kick. Do a test run without the engine brake on and also without cruise turned on and see if you still notice the problem.
Yes, the problem is still there without the engine break on but it is not as noticeable. It will sometimes kick when going from 1st to 2nd on a hard acceleration.

-B
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Old 10-11-2017, 03:14 PM   #4
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I had a similar situation with my old Alpine Coach that had the MD3060 transmission. This was known to give hard shifts sometimes so I just got used to it. I assume you have a 4000MH which is not supposed to have that problem. I assume the transmission fluid is less than 5 years old and is topped up? You can always contact Allison and see if this is a known problem for your production year.
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Old 10-11-2017, 08:05 PM   #5
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Same question fluid level where it should be?
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Old 10-12-2017, 06:34 AM   #6
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Same question fluid level where it should be?
Good question. I just had an engine oil change and they added 1 qt of ATF to the trans. I assume that the fluid level is fine but I will check it to be sure.

I do not know if or when a trans service was done. The coach has 133,000 miles on it. Maybe it is time?

-B
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Old 10-12-2017, 06:42 AM   #7
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Your transmission uses synthetic Transynd oil so I hope they didn't top up with regular ATF.
Another thought; the drive shaft may not have been lubed correctly and your U-joints could be warn. This would cause a "clunking" noise when you go from accelerate to decelerate.
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Old 10-12-2017, 08:50 AM   #8
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I do not know when the last time the trans was serviced so I called the local Allison service center. According to the person I spoke to, it should be serviced every 3 years or 75,000 miles. He said his techs will reset the shift points and look for any issues when they do the service. I am going to go that route.

-B





Quote:
Originally Posted by Algoma View Post
Your transmission uses synthetic Transynd oil so I hope they didn't top up with regular ATF.
Another thought; the drive shaft may not have been lubed correctly and your U-joints could be warn. This would cause a "clunking" noise when you go from accelerate to decelerate.
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Old 10-12-2017, 10:00 AM   #9
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For newer transmissions with Prognostics the fluid and filter change is 5 years. I believe your transmission doesn't have this so the filters should be changed at 3 years and the fluid at 4 years. Here is a link to the Allison information.
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