Tremec TKX
 

lets see if this is going to be my transmission solution. Very similar ratios to the stock miata 5 speed, rated for 600 ft-lbs.



trans
https://cimg4.ibsrv.net/gimg/www.mia...9b5c6335f9.png

I always wanted to see someone with a TKO or TKX in a Miata. Very cool!
What engine requires such a strong trans?

His sig panel

Double check it goes into all gears, multiple shift forks like to engage when bounced around in transit. Had it happen to me, and apparently it's quite common. Fixed by unbolting that shiny 4-bolt plate, and sliding everything into neutral, but that's a bit difficult to access once installed.

yea there was a note in the box about that. shifts fine though.

That's interesting.
I'm very used to the BMW ZF 310/320 tansmissions and with a properly serviced shift linkage, they are very nice and strong boxes, especially the GS6-37BZ (I have one in my Z4 and a ZF320 in my E36).
Both can handle 450+ wtq all day, so is this more like a gear ratio thing?

I don't want to offend anyone, I'm just curious, because the ZF swap is very well documented and easy to do. I'm sure there is a good reason, please enlighten me =)

This is the setup I'm considering, what vendor did you get the trans/bell from?

The only downside on paper for one IMO is the RPM range they operate in, I'm curious how well they shift near the limit they supposedly have.
per Tremecs site.

I'd like to see how the fitment is compared to a Miata trans, in regards to tunnel clearance/exhaust and shifter position. Please post more info as you get it installed!

Good luck. :D

I've been eyeing the TKX as a replacement to my T-5z, which doesn't exactly enjoy shifting where I like to enjoy shifting. It'll also be nice to get away from the .63 5th gear (.8x available for the T5 aftermarket). I was hoping to go over a few questions with them at PRI but I don't see them on the exhibitor list. I need a shift offset of 23.700. My offset shifter gizmo works well but has a harmonic at lower RPMs. That and mechanical speedo interchanges, etc.

Looking forward to reading your experiences.

Also looking forward to hearing about your experience with it, especially how it shifts at high rpms. I've been thinking about putting a T-5 behind the Cosworth in my Capri, and this sounds like it might be just the ticket...

@fastivab6tg25mr is literally installing the same thing at the same time right now, also very interested to compare notes/feedback :likecat:

@Bronson M has one behind his LS and I think he really likes it.

Im planning to go with a TKX when I do my LS swap in the 24-25 off season.

Yep got one installed and boy I wish I had done it sooner. Cd009 was a massive mistake. The trans is a little rough around the edges, get a little snick from the syncros when cold, reverse isn't syncronised. Shifter feel is very ka-clunk and I mean that in the best way possible. It would never fly as an OEM trans but when you get mean to it, it just eats it up and shifts every time and does so super fast. I've only tested it up to 7200 but had no issues there. If you do have issues liberty will faceplate them for $1600. Bonus points that it weights right at 100lbs so much lighter than a t56.

Here's some video from my last event with it.

I am considering this for my k24 (future turbo) mainly because I’m in an exocet so any trans mount will be custom. As others mentioned in slightly concerned about 8k rpm shifts.

I would likely keep the k to Bp adapter plate and flywheel and then just do a Bp style bell housing.

what is everyone doing for a throw out bearing?

This is working well for me, you gotta get the shims right though

https://www.speedwaymotors.com/Chevy...MaAuGlEALw_wcB

Don't tell Tremec, but on a customers 13b with the bellhousing indexed to .001", he is shifting regularly at 8500-9000 rpm. It's all about stacked tolerances. This is on a non-faceplated box.

I logged .186 second shifts using flat shifts with syncros........ It's fucking fast

Im just now starting on this swap myself, except all the quicktime bell housings are on back order and from what i hear the dates typically get pushed back, so im attempting to make my own using an automatic bell housing. The automatic bell housing im using the center's runout is only .005 which is the max spec for the tremec so i have a few ideas that might make this im hoping atleast a pretty simple build. I might make my own thread though to go in depth with it.
Also curious what clutch your going with and what kind of slave/master setup?
https://cimg0.ibsrv.net/gimg/www.mia...eccdc6941d.jpghttps://cimg9.ibsrv.net/gimg/www.mia...4d06545c61.jpg

Which version of the TKX did you go with? How goes the install?

do you have any picture or measurement with the QuickTime on how far in the input shaft sits in relation of the front of the bell housing?

The quicktime housing is now discontinued and canceled my existing order. They told me at least 3200 to “custom make one” even though they have probably made this housing for 10 years or more now.