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Old 01-19-2009, 07:33 PM   #1
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I'm not a Tiffin owner, but one of my travel partners is and I thought I would pass along this information in case it might be helpful to anyone. We were heading out into the desert to boondock when his 2004 Allegro Bay came to a halt. It wouldn't go, wouldn't do anything in any gear. After turning it off and recranking it several times, the warning light "range limitation" or something like that came on so he quit trying to get it into gear. We looked it up in his service book and it related to the Allison Transmission. He had it towed into a repair shop and they found out that when he had his 50k mile service, which consisted of changing the transmission fluid and filter, the shop had put on a Chevy filter, not an Allison filter, and had modified it to make it fit. It had fallen off and the transmission had automatically shut down to prevent any damage. He called the shop where the service was performed and they paid for the repairs - which consisted of taking the pan of, putting on a new filter and putting in new synthetic transmission fluid . . . over $500 worth of work. The mechanic here told him what to look out for and told him that there COULD be damage but it's not showing up at this point and if it's not showing up, he can't do anything about it - to keep a close eye on the performance, warning lights, etc. So . . . from an Allison mechanic, only Allison transmission fluid filters are supposed to be used and damage can occur if another filter is put on and "made" to fit . . . thank goodness it didn't damage the transmission . . . as far as we know. My friend isn't one to sue people - that's why he called the shop that did the service and told them what had happened and gave them the chance to do the right thing - which they did. But, if there's more damage . . . he'll have to cross that bridge when he comes to it. The original shop seems anxious to do whatever it takes to make things okay again. And they said that they were concerned because they had put those filters on other rigs . . . .

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Old 01-20-2009, 03:56 PM   #2
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Have your friend take his coach to an authorized Allison dealer and have them pull a sample of fluid. They can do a chemical analysis of it. Let them drive it for another 3 - 4,000 miles and have the test redone. This should show any potential long term damage to the transmission. Knowing that this may take some time to put the miles on, make arrangements with the offending shop to see this process through.
Bill Mahan
2012 Allegro Bus 43 QGP
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