External Transmission Control Filter

This one’s easy….. Allison requires it at 5000 miles. Then you’re off the hook until many miles later. (50,000/24M). Here it is:

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You’ll find it on the bottom of the transmission, can’t miss it. There’s a magnet there…. clean and place on new filter! You’ll need a little Allison Fleetrite Synthetic ATF to top it off again when you’re done. I bought a gallon, some people bring a small container and schmooze the shop out of a few ounces out of the bulk barrel. By all means, read the Allison book that came with your coach, or download from the web…

https://www.rvtechlibrary.com/transmissions/1000_2000_operators.pdf

The book mentions another filter, the auxiliary lube filter. The best I can tell it is NOT installed on the 2500MH.