The transmission is starting to slip.
When dealing with a slipping automatic transmission, unfortunately there is not a lot that can be done without sending it to a transmission shop and spending a good amount of money on repairs. The reasoning behind this is because automatic transmission have clutch pack that contains lots of little clutch discs that have clutch material on them. Over time, the clutch material wears off and is now floating around in the transmission fluid. The clutch will start to slip, but it will engage because the material in the fluid starts to work. If you change the transmission fluid all of the clutch material that was in the fluid is now gone and all that is left is the slippery new clean transmission fluid that won’t allow the clutch packs to engage at all. This is different with a manual transmission as the clutch is located outside of the transmission in between the transmission and the engine.
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