Ok unsure how this relates to anyone in particular. I searched and searched for an answer with nothing to guide me. I am a mechanic but not too experienced with transmissions. So this truck is a 05 Chevy avalanche 2wd. Car drove fine hit all gears under heavy/light load did not matter. Roughly after 5 minutes it would slip, rev, and you would just coast to a stop. And repeat! So I am in a very tight budget so this is exactly what I did and received successful results. First I disconnected the battery overnight (just in case the computer needed to re-learn driving conditions) next I used a hand-siphon pump (down the dipstick tube) to remove apx 3.5 qts. (So when I crack the pan fluid would not go everywhere due to no drain plug in pan) Fluid was terrible shape. Next I cleaned pan magnets removed filter. Then I removed shift solenoids and transmission control solenoids. I sprayed sensor cleaner in the ports and crevices of the valve body. Next I ohm’d out the shift solenoids (21.2) in each when spec is 20-30 ohms. Next was control solenoids could not find spec. So I bought one and ohmed it out they were within .1 so I assumed all was good. (Returned for $ back) replaced all o rings on solenoids reinstalled solenoids new filter gasket and pan. I filled with fluid substituted 2qts with Lucas trans fix let it idle 30 min frequently going through all the gears. Reached op temp and correct level. Went for test drive initially heard clicking from torque converter and felt a distinct hesitation during shifts..... drove lightly then drove harder followed by freeway driving an hour later transmission shifts like brand new! So total cost was $102 parts fluid filter gasket and o rings...... like I said I’m not a transmission specialist nor do I have extra money on random parts..... it’s been 1000 miles and still like new.... I hope this helps I know this process is similar to Tahoe Yukon Denali Escalade Silverado Sierra avalanche camaro firebird gto and possibly many more