@Reaper, would it be worthwhile to have a custom 4th gear made that can hold the torque that you and others are putting out? I've found a fair number of racing transmission manufacturers that could cut a stronger gear for you. Although that would move the failure point to somewhere else, I'm sure.

It would be the synchros then. The carbon synchros would be expensive as well.

I found a company that builds dog boxes and sequential manuals (for STi's, at least,) rated up to 590 lb-ft. I imagine that would be cost prohibitive as well, unfortunately.

Thats why I asked about a rwd converted STi trans.

You'll have a bump hanging down where the front diff is, but I suppose you could use that to hold more transmission fluid and run cooler.

I'd have to wonder where the shifter would fall. The STI engine is mounted in front of the front axle, and the shifter's right on top of the transmission. Our engine is on top of/behind the front axle, but our shifter is extended backwards from the transmission. It would be perfect if pushing the STI transmission back to mate with our engine lined it up with the shifter hole in the tunnel. Swaps don't usually go perfectly, though.

that's the nature of a swap lol

I wonder if an Aisin AY-6 could fit

"A quick primer on Toyota’s 6-speed manual RWD transmissions
Although our earlier article covered this ground in far greater detail, a recap on Toyota’s 6-speed manual rear-wheel-drive-centric transmissions is in order. In essence, there are only three of them: The Getrag 233 / Toyota V160/V161 used in the legendary Supra Mark IV Twin Turbo; the Aisin AY6 / Toyota/Lexus RA60 series and the Aisin AZ6 / Toyota/Lexus J160. The AY6/RA60 series is, essentially, a beefy truck transmission whose vague shift feel is decidedly subpar for a rear-wheel-drive transmission. Except for RA62 (Lexus IS 250 and, allegedly, Scion FR-S and its derivatives) and RA63 (Europe’s Lexus IS 200d and IS 220d diesels), its other Toyota applications are in Tacoma and FJ Cruiser."

https://kaizenfactor.wordpress.com/2...n-or-is-scion/

Im not sure if it would be a good shifter feel even if it did fit.

That would likely weigh almost twice what the stock transmission does, and hang about 5-6" lower as well.

whats wrong with the tremec route again?

No one who has done the conversion has posted any reviews or details on it.

i have heard that the late m3 6 speed tranny is just as good as the supra and not as expensive, but have not been able to confirm it

Someone needs to try and fit it

Horrible shifting over 6500rpm, really tall gear ratios making it useless for a lower torque application.

Sooo what you're saying is all of us with built fa20's are screwed? lol

really? i would not think this since 2000 m3 inline 6 engines were hi-reving engines. 8,000 rpm and again its a getrag tranny just like the supra
some m3 owners are making 700whp plus on stock engine and tranny.

If you had read the quote my response was to the tremec series of transmissions not the BMW getrag. And the supra v160 was only used in the e39 m5 not the m3

got it my bad..

Are you still using the stock transmission?

Yup

How many toasted?

None

Idea?
https://neatgearboxes.wordpress.com/...x-circlip-mod/

I love the direction and information packed in this thread