Tran - Turb
- Transfer case (transfer box)
- Transfer case ratio
- Transfer port
- Transistorized ignition
- Transition curve
- Transition system
- Transmission
- Transmission brake
- Transmission loss
- Transmission tunnel
- Transverse force
- Transverse member
- Transverse seat
- Transverse spring
- Transversely-mounted engine
- Trapesoidal belt
- Traveller's car
- Tread
- Tread change
