TII Transmission Adapter plate for miata!!! - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-25-2013, 09:23 PM   #1
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Default TII Transmission Adapter plate for miata!!!

It's been talked about forever and ever and Here they are, adapter plates to put a TII transmission onto a miata motor. TII transmissions are significantly larger than stock miata boxes and are documented to hold well into the 400-500whp range. I broke 2 miata transmissions with 200whp.




CAD Designed, CNC machined, made in the U.S.A. Plates are laser scanned and converted into solid works and CNC machined for a quality, final product.



$450 SHIPPED in the CONUS with the plate and hardware you need (Plate to motor, trans to plate, and starter.)













Stock miata parts used:

miata slave cylinder, throw out bearing, pilot bearing, 5 speed starter

What you need to buy:

NC miata clutch disc. (1.8L clutch/flywheel only)
(replacement discs are CHEAP)

Turbo II transmission

Custom Driveshaft (I recommend Shaftmasters (aluminum) but local driveshaft shops are usually capable)

What you need to make/modify:

Space out stock FC clutch fork with 2 washers (make up for plate thickness)

PPF solution
(Differential mount/transmission mount, Adapting Trans to accept PPF)
(several roadster owners have documented solutions to this problem already)

Notch V shape in bellhousing to accept miata starter




Not for dog box transmissions, do not put plate on your dog





PM me with any questions, inquiries, or if you just want to buy this and stop worrying about transmissions.
Attached Thumbnails
TII Transmission Adapter plate for miata!!!-img_2470.jpg   TII Transmission Adapter plate for miata!!!-fcbuild07-26001-1.jpg   TII Transmission Adapter plate for miata!!!-fcbuild07-26003.jpg   TII Transmission Adapter plate for miata!!!-img_1433.jpg   TII Transmission Adapter plate for miata!!!-img_1435.jpg  

TII Transmission Adapter plate for miata!!!-img_1436.jpg   TII Transmission Adapter plate for miata!!!-img_1437.jpg   TII Transmission Adapter plate for miata!!!-fcbuild07-23020.jpg   TII Transmission Adapter plate for miata!!!-fcbuild07-26002.jpg  
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Old 03-25-2013, 09:31 PM   #2
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I was under the impression that you could put the Miata bellhousing on the TII box and you wouldnt need an adapter plate, but I must be misinformed

Very nice work
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Old 03-25-2013, 09:33 PM   #3
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Quote:
Originally Posted by Full_Tilt_Boogie View Post
I was under the impression that you could put the Miata bellhousing on the TII box and you wouldnt need an adapter plate
NA FC (aka a miata transmission) not TII
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Old 03-25-2013, 10:09 PM   #4
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Quote:
Not for dog box transmissions, do not put plate on your dog
Lol.

GLWS(s)
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Old 03-25-2013, 11:30 PM   #5
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If I didn't already buy my clutch I might be interested.
GLWS
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Old 03-26-2013, 01:35 AM   #6
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Nice part. Good to see you made some for others...I wish I did not sell my TII trans.
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Old 03-26-2013, 05:09 PM   #7
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You'll need to cut off the starter portion of the TII bellhousing because of the lack of exhaust / downpipe clearance in the miata.
The RX-7 TII slave will fit without having to cut into the miata frame rail as you do if you keep the stock slave.

Last edited by Adamsm; 03-26-2013 at 06:03 PM.
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Old 03-26-2013, 06:26 PM   #8
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Why would a stock slave interfere with the frame? It's on top of the bell housing
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Old 03-27-2013, 01:25 AM   #9
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Quote:
Originally Posted by theshdwconspracy View Post
Why would a stock slave interfere with the frame? It's on top of the bell housing
Near the bottom of the page.
TII tranny into Miata!!

The bleed nipple on the Miata slave points to the left of the engine bay while the RX-7 slave points up.
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Old 03-27-2013, 03:02 PM   #10
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Pretty good stuff! It is a bit on the steep side as far as pricing though. Doesn't look like you have any dowels for the plate to transmission side, is that correct?
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Old 03-27-2013, 10:08 PM   #11
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What did YOU do for the PPF? This swap does interest me, as the TII tranny gives me gearing I like when used with the 3.9 rear end.
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Old 04-01-2013, 05:17 PM   #12
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^ Same question. I have seen some use a cut PPF that bolts to the trunk floor. My question is, how's the center console and shift boot after all this? Does it look stretched in 2-4-R?

How many of these things you got?
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Old 04-02-2013, 12:11 AM   #13
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I didn't. All the pics in the link above are your best bet.

I would get rid of the ppf altogether and run a trans/diff mount
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Old 04-12-2013, 05:28 PM   #14
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Nice man glad to see you finally got them done!! They came out great.

Quote:
Originally Posted by bcrx7 View Post
Pretty good stuff! It is a bit on the steep side as far as pricing though. Doesn't look like you have any dowels for the plate to transmission side, is that correct?
It's prob close to $100 in raw materials alone, plus the design work, machining, gathering the hardware, etc etc. I think the price is more than fair.

Quote:
Originally Posted by Leafy View Post
What did YOU do for the PPF? This swap does interest me, as the TII tranny gives me gearing I like when used with the 3.9 rear end.
I ditched mine. It's easy enough to just fab new trans/diff mounts. RX7/miata have the PPF/exhaust on opposite sides of the transmission from one another.

Quote:
Originally Posted by Der_Idiot View Post
^ Same question. I have seen some use a cut PPF that bolts to the trunk floor. My question is, how's the center console and shift boot after all this? Does it look stretched in 2-4-R?

How many of these things you got?
The cut PPF you are referring to is for the diff mount, not the trans. THere are a variety of options available for the diff mount out there.

Concerning the shifting, when I shift into 2, 4, R, the miata boot is a little tight, but it doesn't interfere with shifting. I didn't have to modify the console at all. A keen eye can tell it isn't centered in the console opening, but it never bothered me. Shifter placement, at least for me is also right where I'd like it, ergonomically speaking.
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Old 04-22-2013, 12:21 AM   #15
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No one has bought a single one. Kind of surprised
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Old 04-22-2013, 07:19 PM   #16
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I will buy one once I have a better handle on my finances (head work to get the car running and paying off my Daily Driver come first). I for one am not too keen on pulling my transmission every time I go have some fun and shear off gears lol...
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Old 04-22-2013, 08:27 PM   #17
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Im about to ask if i can buy my RX7 back.... the trans was in great shape, and im sure i can sell the shell for what i buy it back for...
if i can, im definitely game
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Old 04-23-2013, 05:42 PM   #18
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I'd be interested at about $100 lower price point.

Just being honest, maybe that's why you haven't sold any.

Everyone here is cheap, and $450 is more than half way to a 6 speed which seems to be an easier way around the issue...
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Old 04-23-2013, 06:50 PM   #19
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I know there are people who have broken 6-speeds due to too much power/not enough empathy. But they are few and far between. And the one I know apparently sold his before getting it on the dyno.
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Old 05-27-2013, 01:56 PM   #20
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All Plates and hardware are ready to ship! Only 4 left!
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