FYI for the DIY
Disconnect the rear trans cooler line from the trans. Clamp a 5/8 ID hose over the end and put the other end into a bucket or container that will hold a least 4-qts. Drop the pan down and replace the filter and put the pan back up using the new gasket provided. The pan holds approx. 4-5 qts. Add 6-qts of new fluid to the trans. Start the engine, making sure the hose is in the container and pump 4-qts of old fluid out of the trans by putting the trans in neutral. The pump in the trans will not work with the trans in park, has to be in gear or neutral. Add 4-qts, then pump out 4-qts, add 4-qts and pump out 4-qts. Add 2-qts, re-connect the trans cooler line to the trans. You have now replaced the entire volume of the trans, the trans cooler and the lines. Start the engine and check for leaks. Check the fluid level and add as necessary.
AND/OR
Drop pan, change filter, leave bands alone, button up, re-fill. Start truck in neutral, idle a minute. Shut down pull the return line at the trans (rear most), start engine in neutral, have a helper add atf4 the dip stick as you watch the fluid coming out the return line. When you see a color change about 8 quarts, stop the engine and your good. I have done this twice. The BIGGEST thing is not to overfill. Top the tranny by the stick till it reads the low mark. Once the trans gets up to 190 the fluid expands and reads full. Fill a cold trans to the full mark and the fluid will cavitate (bubble). Just as bad as under-filled.