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Old 04-10-2015, 11:55 AM   #29
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Wow,
All this discussion and, the OP still won't come back and answer the simple question, "at what speed does it shift to 4th too soon?
Scott
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Old 04-11-2015, 09:16 AM   #30
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Hi every one. I had some unfortunate things happening and been away from my PC for awhile. So I will try and catch up on some questions.
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Old 04-11-2015, 09:20 AM   #31
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Fireup I have already stated that it shifts to forth gear and over speeds big time.If I am in 6th or 5th and let off on the throttle this happens.
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Old 04-11-2015, 09:36 AM   #32
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Thanks Marty for the info. I have to go to Vegas to a Detriot allison dealer. two and a half hour drive for me. I'm headig that way in June so will get it checked.
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Old 04-11-2015, 09:59 AM   #33
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Interesting stuff here. My previous coach was a 1973 MCI bus that I converted to a motor home back in 93. It had a 8V92 and allison 4sp auto. When the jake was on U had to watch your RPM's when letting off the throttle so U don't over speed. Old school for me. This newer coach with all the electronics is all new to me. I really don't understand the new tech principle on how the ECM's work together. So bare with me if I don't answer your questions right a way. And boys no fighting. LOL.
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Old 04-11-2015, 10:28 AM   #34
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Fire up, still no answer to your question!
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Old 04-11-2015, 10:37 AM   #35
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Fire up, still no answer to your question!
firedoc
Apparently some people do not really want help.
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Old 04-11-2015, 11:24 AM   #36
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Fireup I have already stated that it shifts to forth gear and over speeds big time.If I am in 6th or 5th and let off on the throttle this happens.
Not to be disrespectful, BUT you still haven't answered the question.

Let's try this one more time.

What speed in MPH on your SPEEDOMETER are you doing when it shifts to 4th gear TOO soon when you let off on the fuel treadle?

Dr4Film ----- Richard
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Old 04-11-2015, 03:37 PM   #37
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I am only trying to help here. While I've not driven every diesel powered coach on the planet, I'm sure that there's some operational differences in many. I only ask the OP to be specific in ACTUAL SPEED to see if it compares to mine and, many that I have driven and know of the operational characteristics.

As stated earlier, if running at a speed at or greater than 63 mph, and, are descending a grade, and, in 6th gear, then ASK for the exhaust brake, the trans will automatically down shift to FIFTH and run at around 2000-2100.

But, if the grade is such that, that engine and exhaust brake is doing its job of slowing things down, as soon as that speedo hits below 63 mph, that causes the Allison to drop to FOURTH and, therefore, the RPMs instantaneously climb to 2500 + or -. This is why I'm trying to get the OP to tell me the EXACT speed of his when he thinks it's TOO SOON.

While everyone can discuss all the programming of both the trans and engine etc. forever, I know nothing about that and don't profess to. I'm just trying to find out if his acts the same exact way, at the same exact MPH as mine and many I know do.

If his is dropping to FOURTH GEAR at maybe 65-68-70 mph, then YES, it is dropping to fourth TOO SOON and hell yeah, it will over rev. Again, just trying to compare.
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Old 04-13-2015, 09:08 AM   #38
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Fireup. In fourth gear my top speed is around 55 mph. the jake works fine there. When I am above that speed in 5th or 6th gear anything above 55 and let of the throttle it will down shift to 4th.. Like I have been saying all along.
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Old 04-13-2015, 09:44 AM   #39
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What we have here, is a failure to communicate. Maybe when the OP takes his coach to Allison, and has an answer to his concerns, he may share that with us. This is the best we can hope for at this point.

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Old 04-13-2015, 12:12 PM   #40
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Fireup. In fourth gear my top speed is around 55 mph. the jake works fine there. When I am above that speed in 5th or 6th gear anything above 55 and let of the throttle it will down shift to 4th.. Like I have been saying all along.
Well Sir,

We are getting closer to my answer but, you still really haven't answered my question. Unless you're thinking I can read your mind. Let me ask it in a different way. If you're traveling at say, 80 mph and, let off the throttle, does your tranny INSTANTANEOUSLY GO INTO FORTH AGAINST THE JAKE AT 80 MPH?

Or, if you're doing 70, and let off the throttle, DOES IT INSTANTANEOUSLY GO INTO FORTH AGAINST THE JAKE AT 70 MPH?

Or, if you're going 65 and let off the throttle, DOES IT INSTANTANEOUSLY GO INTO FOURTH, AGAINST THE JAKEAT 65 MPH?

Do you see what I'm getting at? What do you claim is TOO SOON?
Scott
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Old 04-13-2015, 09:15 PM   #41
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Jeazzes fire up. I told U that anything after 55 mph in 5th 6th or any other gear it will down shift to forth . What more do U want. this getting ridiculous. I would remove my original post if I knew how! I'm going off into the sunset talking to my self. Ha Ha
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Old 04-13-2015, 09:29 PM   #42
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An Allison Transmission is a LOT smarter than 99% of the people using it in a vehicle.

For those people who have no clue as to how one works may I suggest that you spend an evening with the manual, you might learn something.

Dr4Film ----- Richard
WHAT!!!

Read the manual? That's the last thing people want to do, especially before professing to know what they think they know!
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