- Trouble shifting gear due to dirt or gunk in the fluid, causing the response of the transmission to become sluggish.
- Erratic shifting while changing gears, causing them to either happen too soon or too late.
- Surging transmission.
- Delayed gear engagement.
- Gear slippage.
- Transmission overheating.
High mileage vehicles that are over 60,000 miles will need their transmission fluid flushed of all previous fluids. Doing so will result in removing the leftover gunk and loose metal fragments left behind from the previous transmission fluids, which will help prevent future complications with the symptoms listed above.