If it's anything like the 5-speed Allison in my rig, it is very much like changing the oil -- there is a drain plug and a spin-on filter. Two things to watch out for -- the sealing washer on the drain plug and the magnet under the filter. Make sure you recover and reuse both. Actually, a new sealing washer is a good idea. Out of a 15 quart capacity, this simple drain & fill used 10.5 quarts on mine. Measure what you drain out, then add that much new fluid back in and then check dipstick level per procedure.
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