Differences between RX-7 SA/FB/FC and NA Miata Transmissions

Quick video on the differences in the common trans between the generations.
Info on the miata-rx7 trans swap:
www.mazdatrix....
Comment, Like, and Subscribe for more. Follow me on instagram for more frequent updates
@rototurd
Follow the race team @WastingMoneyRacing
wastingmoneyracing.com

[@joshuachandra6677]

Thank you for this vital information

[@DerringtonLatour]

Thanks for the video man!

[@westtnmudders]

Great video 👍🏼

[@ramoncruz9910]

Thank you for the information brother😬😬😬😬👍👍👍🙏🏼

[@jamesford3549]

SAs did come with a 5 speed. Main difference is the bendy shifter and the shifter turret isn’t a separate piece. The other difference you didn’t mention is FB and FC ratios

[@CastellawSpeed]

I have never seen a SA USDM 5 speed. I didn't go into details on the ratios since that can be found easily. This is more for swapping in general.

[@jamesford3549]

@@CastellawSpeed uk they were all 5 speed

[@CastellawSpeed]

@@jamesford3549 ah yea see the first gen for you all was called SA the whole time where we had SA, S2 FB, and S3 FB.

[@jamesford3549]

@@CastellawSpeed no we had SA 79-80 and FB 81-85 like US. We always had 5 speed. I think 5 speed was an option in US

[@shibuko8400]

Are the bushings connecting the Shift knob to the trans the same on all gearboxes ? Could you put an MX5 short shifter in a FC for exemple ?

[@CastellawSpeed]

Yes. There are some differences in the fb trans but the fc and miata trans are essentially the same.

[@joefietsam195]

Power handling is different as well right

[@CastellawSpeed]

Not really. All have the same gear sets for the most part.

[@samdyne8217]

Hi would a nb miata 6speed trans be the same principle as the na 5speed with compatibility?

[@CastellawSpeed]

No the shape and size are different. You can't do the bellhousing swap or swap the tail section onto the rx7 trans.

[@robert_gasser]

I have an 12a 1983 fb rx7 and it makes bearing noise in every gear but 4th. Could i put an na miata box if i swap the bell housing? Is the shorter inputshaft a problem?

[@CastellawSpeed]

Yes you have to shorten the input shaft or it won't bolt up. It will bottom out in the eccentric

[@robert_gasser]

@@CastellawSpeed wouldn't the miata input shaft be too short in the rx7?

[@CastellawSpeed]

@@robert_gasser no see link mazdatrix.com/miata-input-shaft-modification/

[@jakewiseley8732]

So I have a 12a Bridgeport with a top mount starter ,I have a miata 5speed box to go with it and the bellhousing in the middle with the starter down bottom left,which starter do I run and what do I do about where the other one goes lol

[@jakewiseley8732]

The bellhousing in the middle transmission of your video to clarify

[@CastellawSpeed]

I don't follow. To run the miata trans you have to swap the bell housing to a 12a bellhousing and shorten the input shaft and splines.

[@jakewiseley8732]

@@CastellawSpeed yes this is done

[@CastellawSpeed]

@jakewiseley8732 you would then need the same starter as what the bellhousing you swapped to used

[@alexanderrivera997]

What kinda clutch can I run for the swap ?

[@CastellawSpeed]

Depends on the flywheel you run.

[@cj4560]

Okay so what would need to be to throw a miata 1.6 in a fb? Would it be the reverse?

[@CastellawSpeed]

Yeah swap a 5 speed rx7 tail section onto a miata trans.