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Old 11-08-2019, 10:27 AM   #1
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1999 RV

I was driving my RV and it shifted into third gear and the motor spun freely, so I took my foot off the gas and try it again, and it spun again, then the check transmission light came on and I drove it home at 30 miles an hour in first gear, when I got home I could not change gears with the Allison Transmission keypad, I could not go into neutral,I could not go into reverse, so I turned the engine off waited a half hour, I turned the RV back on, the engine started, and trans was in neutral, and I reparked the rv, and I am writing to you now.

it's a 1999 Dutch star Newmar cat 300 with an Allison Transmission, it has a hundred thousand miles on it, The third-gear has always slipped, I had the transmission fluid changed around 80,000 miles, the trans fluid level is good. last week I had the radiator replaced.
What are my options?
Where do I take my RV,
how much to replace a transmission.
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Old 11-08-2019, 08:39 PM   #2
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Were the filters replaced at fluid change? Allison has 2 internal filters that are accessed through 2 plates on tranny bottom. You will lose a few gallons of fluid when the plates are removed.
This would be a good time to have a new fluid analysis performed, this tells what is happening internally.
Personally, I have local HDT repair shop perform my chassis work, much more knowledgeable mechanics than an RV place IMO.
Afterthought, I would request a moderator move this to the Allison Transmission forum for better exposure to expert information.
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Old 11-09-2019, 05:55 AM   #3
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Quote:
Originally Posted by dutch99 View Post
I was driving my RV and it shifted into third gear and the motor spun freely, so I took my foot off the gas and try it again, and it spun again, then the check transmission light came on and I drove it home at 30 miles an hour in first gear, when I got home I could not change gears with the Allison Transmission keypad, I could not go into neutral,I could not go into reverse, so I turned the engine off waited a half hour, I turned the RV back on, the engine started, and trans was in neutral, and I reparked the rv, and I am writing to you now.

it's a 1999 Dutch star Newmar cat 300 with an Allison Transmission, it has a hundred thousand miles on it, The third-gear has always slipped, I had the transmission fluid changed around 80,000 miles, the trans fluid level is good. last week I had the radiator replaced.
What are my options?
Where do I take my RV,
how much to replace a transmission.
First, look in the operatorr's manual and determine how to check for trouble codes. Your model year is around the time that Allison WTEC-III controls would be appearing in motorhome transmissions. If yours is so equipped, it is a simple matter to check oil level and retrieve codes from the shift pad. WTEC-II controls may offer similar functionality - I just don't know.

The Allison website has the manual. The Allison website also can steer you to the nearest Allison-authorized dealer. If you do need service, that's the place to go. They have proprietary diagnostic tools.

Except for the part "The third-gear has always slipped..." what you described could easily be an intermittent electrical connection.

FWIW
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