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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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  #1  
Old 04-01-2014
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Default Allison Transmission Leak

Since changing over to Transynd, the transmission has developed what looks like an output shaft seal leak that has been getting steadily worse. The last 1000 miles it has lost a full gallon. Does replacing the seal require special tools?
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Old 04-01-2014
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if you can get the driveshaft out,and the Yoke off,you have it made.
Big hammer for the driveshaft,and a big socket for the nut on the yoke.
If your on the road,find an Allison shop to do it.
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Old 04-01-2014
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Find an Allison shop period. There's a reason I tell people to be wary of upgrading to syn oils in experienced transmissions. Ran Dextron in my 600 series for 80k miles, changed the filter once. No grief. Went with Amzoils excuse for Transynd since I went to the MD as it was a fresh reman example.
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Old 04-02-2014
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Thanks Randy and Mike. It was an expensive changeover and now an expensive leak, messy too. If it doesn't get worse, it will take two more gallons to get home, so might as well look for an Allison shop somewhere. Nearest one to Blanding, Utah is in Farmington, NM. Anyone had experience with them or any other shop in this part of the country?
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Old 04-02-2014
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I had an excellent service call at the Farmington NM cummins shop. They took good card of me and seemed genuinely concerned about the problem with my M11. I bet they are familiar with the Allison facility there and could advise you on it
One of my riding friends had service done on his coach at the Cortez CO cummins house and was pleased with their work.

We are going to Moab in 3 weeks. Grab your Dirt Bike and come up and hit the trails with us.
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Old 04-02-2014
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Thanks for the info Max. We just left Moab yesterday after 2 weeks of 4-wheeling. Wish we could have stayed for 3 more weeks.

I know that spot in the picture, it's in Bluff, UT.
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Old 04-02-2014
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Another option to Blanding, is "Smith Power" in Salt Lake City. They are the Detroit Diesel and Allison shop. HOWEVER, I do NOT recommend them. I took my bus there in November just before putting her to bed for the winter. What was supposed to be a two day, oil-change and tranny flush turned into a week of broken delivery dates, broken promises, and a very expensive bill, along with flat batteries. (OK, I should have shut them off, or at least disconnected them, but it started out as just a quick two day service).

My bad experience notwithstanding, they are a BIG shop, and service a lot of transmissions. Smith Power, 3065 West California Ave. Salt Lake City, UT 84104 (800-658-5352) I would just suggest that you get some kind completion guarantee on the front end.
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Old 04-02-2014
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Thanks John. Hopefully I can find someplace on our way home through New Mexico.
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Old 05-07-2014
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A follow up to the transmission leak. After a through cleaning with several cans of brake cleaner, I could see that the leak was a hose. Allison in Grand Junction, CO replaced two old hoses and the leak went away. I asked about Transynd causing the problem, he was sure it was the age of the old hoses and not the Transynd. The only thing they use is Transynd whether it's an old or new transmission. The output seal does drip a little, but it's not significant.
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Old 05-07-2014
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Lucky you!
saved some bucks on that!
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