Even if you’re an experienced home mechanic, there are parts of your car that probably give you trouble. They’re either too hard to access or too complex to work within your garage. Transmissions tend ...

This article was updated Feb. 28, 2023. It was originally published March 1, 2000. Planetary gears can supply high levels of torque and high-speed reduction. They are also relatively compact compared ...

• Planetary units with helical gears, rather than spur gears, have higher torque capacity and run quieter. • Different manufacturers measure and rate backlash in different ways. • Software tools for ...