Arrow Fat Left Icon Arrow Fat Right Icon Arrow Right Icon Cart Icon Close Circle Icon Expand Arrows Icon Hamburger Icon Information Icon Down Arrow Icon Mail Icon Mini Cart Icon Person Icon Ruler Icon Search Icon Shirt Icon Triangle Icon Bag Icon Play Video

13B and 20B Rotary T56 Magnum swap kits for the FD3S - Updates

After test fitting a Tremec Magnum-F, along with some other R&D on the FD3S rotary chassis, I have updated my current rotary T56 Magnum kits to now only use the manual version bellhousing going forward.

The manual version bellhousing uses an FC3S starter, which mounts rearward towards the transmission. This setup works better for all applications and makes it simpler to manage on my end. This also was done out of necessity, due to the most 20B swaps engine mounts not allowing the automatic starter to fit at all.

The manual version bellhousing will fit both an auto rear plate or manual rear plate, so it only makes sense to do one kit.

The only downside to this style kit is the fact I have to take extra time to machine the magnum trans case to be able to fit the starter. This adds some extra labor costs, but in the end you end up with a beautiful bolt-in kit. See the pictures below showing where I machine the magnum case.

Here is a video of the installed transmission:

-----

The only bad news, is during this recent R&D I found that the new Magnum-F transmission does not fit well in the FD3S chassis behind the rotary motor. Unfortunately, even though the magnum-F shifter is further back, it still does not sit back far enough, and you would have to cut your tunnel at the front of the shifter hole to clear (see pic below of me trying to test fit a Magnum-F in the FD3S).

Magnum-F Mazda RX-7 FD3S RX7 FC3S Rotary 13B 20B LS1 LS3 LS swap

Tremec T56 Magnum-F Magnum FD3S RX7 fitment tunnel LS LS1 LS3 LS7 swap T56

The downside to this is an extension shifter will still be required. There is no sense in paying the extra money for a Magnum-F, and then still pay for and have to run an extension shifter on top of that. It is cheaper to run the regular magnum and billet relocation shifter setup (Sikky).

Questions or want pricing on a complete setup? Feel free to contact me - I prefer email