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Old 12-24-2016, 06:34 AM   #1
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Tranny fluid change

It's time to service my Allison on my DP. A friend told me if I change to synthetic, I can go 100k until the next service. Any thoughts?
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Gary Goldman
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Old 12-24-2016, 06:49 AM   #2
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I would stick with Transynd. You could then, at service interval, take an oil sample and have it analyzed. Chances are you will be able to go beyond the service interval. I would still change filters at recommended interval.
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Old 12-24-2016, 07:03 AM   #3
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Try the Allison discussion area.
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Old 12-24-2016, 09:50 AM   #4
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Allison recommends changing synthetic tranny fluid every 48 months, regardless of mileage. Most Rvs will hit the 48 month mark long before the mileage limit.

However, Allison also says that a program of periodic fluid testing (fluid analysis), coupled with regular filter changes, can be used to determine the need for fluid change. I ran Transynd in my Allison 3000 for 12 years, changing filters every 3 years per Allison recommendations. The fluid still tests ok, but its finally starting to show signs of contamination (even though lubricity and such are still OK).
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