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  • Grannas Racing Rotary to TREMEC T56 Magnum swap makes things simple
  • Post author
    Joel Grannas

Grannas Racing Rotary to TREMEC T56 Magnum swap makes things simple

I had issues breaking factory mazda transmissions when making 650+whp... So I did what I always do... and created a kit to make a T56 Magnum fit in the car. SEE VIDEO AT BOTTOM OF PAGE

Grannas Racing 13B 20B RX-7 FD3S transmission kit t56 magnum tremec

My GR700A kit for rotary engine applications makes adapting a T56 Magnum to a rotary a breeze. The bell will work on manual or auto rear plates, same thing as swapping a factory auto car to a factory manual, but in this case you'll be putting in a much stronger transmission.

The first rotary kit I am releasing is the most common asked for application, the Rotary FD3S RX-7 GR700A kit. This kit uses a Tremec Magnum XL, along with my offset shifter to allow for a perfect dead center placement in the OEM transmission tunnel. This kit fits without any modification to the tunnel itself, no hammering, no cutting.

Grannas Racing Rotary RX-7 FD3S mazda transmission dyno tune 13b 20b 12A

The GR700A kit uses our proprietary cast aluminum bellhousing, which is a direct fit, no need for adapters or any other nonsense. If you are buying a complete transmission kit, it will arrive with the crossmember, mount, starter, shifter, and all hardware required. We also will machine the T56 magnum front plate and center case to allow the starter to clear the transmission. This is the Grannas Racing difference... I am very meticulous about making sure everything fits as best it can, and that you get everything you need to make this a painless install.

Grannas Racing FD3S shifter position RX-7 RX7 t56 magnum 13b 20b rotary

I recommend the Tilton ST215 clutch with these setups, which drives super smooth, and has two different power capacities. The sprung-hub organic twin disc is good for 600-650 torque at the wheels. And the cerametallic rigid twin disc is good for 850-900 torque at the wheels. You can see in the video below just how amazing this clutch drives. It is quiet and has a wide engagement range to make for a stock-like clutch experience while having the ability to hold big power.

Here is a video showing my personal car which was used for the R&D of this kit. No more third gear issues! Smooth as silk operation even at high RPM shifting.

  • Post author
    Joel Grannas