Do you have a specific chassis and transmission you are asking about? Generically, I can say that with a gas engine transmission requires you to drive the motorhome some distance to make sure the transmission fluid is hot and parked on level ground to get a proper reading. After you have achieved a hot transmission, with the parking brake set, I put the transmission in park, then drive, then back a couple of times. Some manuals say to take a reading in park and I've seen some others that say neutral, but either way, take the reading with the engine running at idle speed. (I prefer having the transmission in park for safety reasons.) After letting the engine run for a couple of minutes more at idle speed, I then will check the dipstick twice.
Others can probably post a more precise method, but that's the basic process I use. -RT
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Ricardo Tegarini
2005 Itasca Sunova
Workhorse Chassis W20
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