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I dont know if you have a Turbo 400 or a 4l80. However either are the easiest transmissions to work on. If it has a plug drain the fluid into a pan. If not you just loosen all the bolts except 2 at opposite locations and with both loose take one out while holding the pan and letting it tip into a pan. After enough has drained that you can take out the bolt and maneuver it out. Don’t drain all of it you will want to see what is in the bottom of it. There will be a magnet there also and will have a grey powder type material attached to it. That is normal. If there is any shiny silver or gold colored material that is very bad.
Clean the pan out with brake parts cleaner until it is dry and clean including especially the sealing lip around the diameter of the pan. Also clean in the same manner the trans sealing diameter so that there is no material left on it. After you have removed the filter and installed a new one you can spread out new rtv on the pan lay on top of that the gasket and on top of that spread out RTV again. and Install on trans. tightening opposite bolts on the pans. They don’t need to be very tight. It is better to install all of them first so that they align easily.
Fill with Dexron IV. I would use synthetic if you plan to use the motorhome as it will run cooler. Check level while hot.
