2. Rattling Noise
If start to hear a rattling sound while driving, you should stop to check the transmission. If a defect has developed, it will either need to be replaced or the fasteners will have to be tightened. Generally, the rattling noise comes from filters that have become blocked with debris.
The transmission filter is there to keep contaminating particles out of the transmission fluid. However, if the filter fails to keep particles out, the transmission fluid will quickly reach a point where it is too dirty to do its job efficiently. If the contamination reaches a certain level, the transmission fluid can burn and lead to a transmission repair. Check the transmission fluid regularly, not just for its level, but to see if it is clean.
4. Changing Gears Problem
Normally your car should shift easily into each gear, but if your transmission hesitates to shift, then there is most likely an issue. If you find that you are unable to change gears easily or you cannot change gears at all, a problem may have developed with the transmission filter. In fact, the transmission filter may need to be replaced if the gears grind or the vehicle abruptly surges when shifting gears.
5. Burning Smell or Smoke
When the filter has become blocked with the contaminants that it is designed to filter out, it can result in a burning smell. This is a problem that can go from bad to worse very quickly. In extreme cases, it can result in the scary sight of smoke being emitted from the engine.
6. Transmission Fluid Change
If you have a feeling that there is something wrong, checking your transmission fluid will help you test out your concerns. If the transmission fluid has changed from red to brown or yellow, this is a definite warning sign. If you notice varnish on the transmission dipstick, you may have a faulty transmission filter.