So you're using a B2200 bell and an RX-7 NA transmission. Are you not using the full B2200 transmission because the RX7 transmission body is substantially smaller? Is there a possibility you could take comparison pictures of the transmissions?
Looks like you can pick up a B2200 transmission for around $150 from junkyard, in my area at least. I expect RX-7 (even NA) transmissions would be more.
Also, what clutch have you decided to go with?.. is it the B2200 clutch? You had mentioned picking up a clutch from AZ in post 34, but don't think it was clear which one you went with.
Which flywheel? Did you check for B2200 (assumed from bell housing) starter engagement with the flywheel?
I used the rx7 transmission because I heard it would have better gears. I guess I should ask; Doesn't the rx7 transmission have better gears?
Also I didn't want to mess with the chance of the rear housing not matching up with the drive shaft. but apparently if that was a problem i Bet I could have switched them out. There are some small differences though between the transmissions, that may give you some problems if you want to change the rear housing. Like the shifters are different between the b2200/rx7/miata. Not just the part you move in the passenger compartment. I'm talking about where the shifter meets the shift rods. I'll have to get a picture.
I went with a b2200 / n/aMX-6. because they all use the same clutch.
As for the flywheel I bought a Fidanza n/a mx6 flywheel once again because they said it was the same flywheel for the truck too. Not 100% on that but we will see. I think it will work itself out.
Starter engagement is still a big question mark, but seeing as everything else just swaps out I hope I can find something that will work.
I have yet to test fit a starter. I may have to do what gavin did and move one of the ears on the starter so it will work.
i got some crappy pictures but will try to get more tomorrow.
Here is my transmission as it sits now. Its waiting for me to put the speedo gear on and then start putting the housing back on.
Rx7 input shaft (top) b2200 input shaft on rx-7 transmission. I know the gear on it doesn't really look the same but the gears on both of them are the same. Just the input shaft is obviously different.
better picture of the b2200 input on the rx7 tranny
I had to almost completely tear down the b2200 transmission just to get the input shaft out, so its in pieces. along with my spare rx7 transmission.
I was pretty sure I had comparison pictures of the b2200 and Rx7 transmission in this thread. I can re-post them if need be.
I test fit the b2200 bell on the miata transmission. all the bolts and bearings and it looked like it lined up perfectly. I didn't fully put it in place because I would have to take a big rubber mallet and start waling on it to get it to go down. If you want I can get pictures of this tomorrow.