It looks like a promising project, if it worked as a turn key solution. The price of used M4 DCT isn't that big, on the same level of a new manual transmission.

LOL, this is the reason when my input shaft breaks I will just march on down to the Nissan dealer I worked at and order a new trans. You never know, I may get one just to have it when the time comes.

So....... in other words. Nissan engineers worked their magic on screwing a manual tranny. :icon14:

That is probably what makes it as tough as it is. If it were not for the input shaft issue I would not be too worried about it.

Any updates on the SOHO built 6MTs? For those of us who are simply looking to reinforce the synchros for hard driving, drag racing, etc. but aren't pushing crazy numbers (500-600hp) would something like WPC treatment suffice?

I talked to liberty at PRI and they will sell faceplates now. So you get your trans taken apart, ship off the gears, they add the faceplates and ship them back to your builder. Or you can ship them a complete trans for a good bit more

Lady’s and gents. I think i have found the synchro ring that chris was using. Unfortunately i cant find the part number ANYWHERE on this thread and obviously we havent gotten a response back for the part numbers so it looks like he might of just went dormant.

Ill update you all on my findings once i can confirm the synchro is the one in the picture he used. Im 90% positive it is though.

???

https://www.instagram.com/p/C20_wF-s...E1MWVjZGVmZQ==

Im going to tear out my spare old trans and see if the part i found works. I dont want to give out bad info and have people buy synchro’s that dont work.

Ill let you know by the end of this week, should have the trans on my bench soon

I got some realllll bad news for everyone lol. I actually contacted chris via instagram, and he was willing to help with the information. I told him we were all wondering what these part numbers were and off of what transmission from a ford did he find the synchro’s. Heres what he told me :” They were custom synchros I had lined. The idea came from our abuse of the 350/370 trans in road racing. Tremec made carbon lined ones for the T56,TKO, and 6060 transmissions. The issue with us building them was an OEM box was only 1400 at the time and on the shelf. Just a run of the liners for the synchros was 30k. We made two runs when APR was footing the bill and I kept several sets after they sold off the Nissans and went to the KiA“

And then he stated “ Sadly the cases flex to much to even make it worth while. The OEM stuff is good, but a billet case is needed to make anything last. I never looked into making one from billet, we welded some gussets in some to test and never got it tested.”

I found the exact gear that he posted on this thread. Its a carbon lined TKO 500-600 synchro gear from synch tech transmissions.

Heres what i was thinking and how to go about getting better synchros. My first option is getting a 370z synchro and having it cyro treated. All the gears/shafts i want to be cyro treated as well. The 300zx looks super close to the 370z trans so i want to order one ring and see if the ring works with the gear set. Obviously the teeth have to match. Also they make a carbon synchro ring for the F51 trans which i will try buying 1 synchro and seeing if that works as well. If all of this doesnt work then ill just stick to the cyro treated option. Its super weird that they dont make any CD009 carbon synchro rings. I will contact sync tech and ask them if they plan on or have any carbon lined synchro rings for the CD009 or JK.

Sorry for the bad news fellas!

It's just not worth modifying the stock trans. Folks have tried and they still blow gears to pieces. I have been watching for a while. If I do something it will be another stock trans or I will swap in a DCT or a Sequential.

Have they tried cyro treating the gears?

Yup, even installed Billet gears. For the amount of money you would have in the factory trans swapping to something else is a wiser move. T56 swap it if you want to keep the manual trans.
Me, I have other options. I can run a DCT or go to a Sequential with my Emtron ECU.

The stock factory trans can take a ton of abuse. It is just when you get on a prepped surface when the problems arise. Can't leave out No flat foot shifting. It hates that also. It is amazing what it can
take right out the box. I have been over 700whp for quite a while.

I agree the trans is extremely impressive. I have some REALLY good news!
I contacted NISperformance and they said they had a CD009 carbon lined synchro ring in the works. Should be ready in the next few months!

We finally have a fix for the garbage synchro's in the car. I will fix my 5TH gear synchro and then re-build my old trans with the new carbon synchro's when they are ready. I informed them that we could create a group buy to try and get some sort of discount. If you want to be put on their list of people to notify you can just email nisperformance in their contact section or PM me and when their ready ill email you back and we can do a group buy like that!

Im extremely excited for the fix.

Also i agree whole heartedly on the flat foot shifting. Big no-no. Also ive tried MT85 with redline and when i put that in the trans i started having major issues. So i use the factory stuff.

let me know whos interested in these rings, im not profiting from this what so ever also just incase anyone was wondering. Nor do i have a tie to Nisperformance.