My 2017 (sorry I am new just found out this is gen 1 post) Raptor was slamming between gears at 40 to 70 mph when full throttle applications were held on. My truck has 24,000 miles on it. I adjusted the tuner (SCT) between the preloaded stock, 87, 91, and 94 settings to try and help the transmission out. It eventually started throwing codes and ck engine light. I hooked up the Snap On scanner, cleared transmission related codes. Read the All Data information about my truck. Researched information on this forum finding that some early models had problems with loose transmission lines and a clip that was related to the plug at the transmission. All data says to change the fluid at 30,000. There is a dipstick on the right side of the transmission which requires a 19mm open end wrench, a set of gloves (check transmission level hot) and is located 5 inches from the right side catalytic converter. I checked the level and condition of the fluid. It needs to be changed, getting dark, and added 1.5 liters of the reccomended Ford ATF fluid. I would recommend #1 Check your fluid level. #2. Check your fluid condition. #3. Change it every 30,000 miles. #4. Remove the transmission pan and replace the transmission filter when you do your initial flush. Examine transmission pan for foreign particles, parts, anything that can help you determine if you need to go through your transmission. If initial pan drop is clean, install filter, fill and flush. If you have more than normal clutch wear in the pan, leave it, don't touch the filter, reinstall the pan and put the dirty fluid back in the transmission (this is if you are under 5 years or 50,000 miles). Get Ford to fix it. Don't tell them that you pulled the pan, they purposely hide the dipstick and don't give that information to the general public as they want to control what goes in the tranny, and have had problems in the past with over and underfilled failures while still under warranty. Once my transmission was full, I was still having bad shifting issues. More research told me that some tuners boost engine performance with the ECU for the Engine, but fail to reprogram the Transmission ECU. I talked with several tuners and found a company by the name of JDM Engineering. I bought an Emailed tune, downloaded it to my SCT box, programmed my truck. The engine and transmission operate in harmony now. The shifting is amazing in every mode. I am very happy with Jim and Jim Jr. as my truck has better performance, better drivability, unbelievable transmission operation. Highly recommend these guys. I would also request any further information from any other people who have opinions or experience in any of my discussion. Has anyone figured out how to get their Gen 2 Raptor to get rear axle locked up in 2wd so you can have unlimited fun on the beach?❤