four-speed

noun3

1. •
   [before a noun] Having four forward speeds.

   • My car has a four-speed transmission. It is not as efficient as my daughter's five-speed.
2. •
   A transmission that has four forward speeds (it might or might not be a manual transmission); (metonymic) a vehicle with such a transmission.
3. •
   (informal, historical) A manual transmission with four forward speeds; (metonymic) a vehicle with such a transmission.

   • A: Was your dad's Mustang a four-speed? B: No, it was an automatic.