Can I install a dual-clutch transmission on a Mazda RX-7 FD with a 13B engine?

If you are looking into alternative transmission options for your FD, Mazda standardized the rotary bellhousing bolt pattern in 1974, meaning almost any rotary manual transmission will physically bolt up to your 13B engine ¹³.

Despite this interchangeability, it is generally recommended to stick with a factory 5-speed manual transmission from a 1993-2002 FD ¹³.

If you are looking to upgrade to a modern gearbox and are willing to do some fabrication, installing an RX-8 6-speed manual transmission (specifically the 2009+ S2 or 2004-2008 S1) behind a 13B is a known swap that offers faster shifting and updated gear ratios ¹. Keep in mind that fitting an RX-8 transmission into an older RX-7 chassis requires:

• Fabricating a custom transmission mount.
• Having a custom or modified driveshaft made.
• Using a shift lever extender or custom shift linkage to reposition the shifter correctly in the cabin ¹.