Mainshaft with 1-2 gears. 3rd is custom from GT Gears and 4-6 turbo's. 2-4 with steel synchros. Cup's mid and end housings and cooling. 997 Cup's LSD, that one I've had for 6 years. Preload is abt 150 Nm...

 

I also used the TT main shaft - slightly better gearing and the steel synchro's ($$$$). My LSD has a combination of MS and Guard plates. Someday I will just install the Guard unit.

Did you go through the shimming process yourself? I farmed it out, since I wanted to be sure it was correct, and I was tired of working on the tranny...

Ray

 

Yes and no to shimming. Turbo's main shaft is rather good for higher revving GT3's engine, my redline is at 7200 so GT2 suits better for me, with that longer 3rd. A bit longer 4th could have been good too, but I had to draw the line somewhere, considering spending money.

 

I have a turbo 1-3 main shaft including the gears available cheap if anyone is looking to do the same conversion. Perfect condition. I swapped over to the 7GT2RS mainshaft.

 

Rbhar,
Congrats with your tranny journey.
One thing come to mind as I was reading your tread.
You must be very talented as the tranny looks like a Rubik cube , courageous - especially if this is the first time on this tranny type.

 

I have read most of this thread and am frankly amazed.

I have an 04 GT3 that I have owned since new. It has 60K miles on it, mostly track. I have been kind to the transmission, only grinding the gears a very few times. I suddenly developed a problem shifting, involving all if the gears, but mostly 3 and 4, which are the ones most used.

My local Porsche guru Chris says it could be clutch wear resulting in the clutch not disengaging properly, or it could be some "needle bearings" (??) similarly hampered the clutch operation. In any event, the engine and transmission must come out, so the advice is to get the transmission freshened regardless.

So my question...can anyone recommend a shop that can freshmen a transmission....replace synchros and other bits that might be worn??
Thanks.

 

Spell correction correction.....freshen an o4 GT3 transmission.....

 

Call Brian Copans, his business is called BMC & Gee. You'll be very happy if he does your trans, known expert/guru.

 

Thanks. I had seen him mentioned earlier in this thread I think. I am in Canada, close to Ogdensburg, NY and was hoping to find someone closer.

I did call him and was very impressed with what I heard.

 

I know this might sound super simple... But I was too under hard braking and acceleration. Also noticed weird vibration on hard cornering. Turned out it was trans mount. Mount was a 997.1 about 5 years old replacement but the 997.2 has even better support. Included friction first inserts and now super tight.

 

Does anybody have the phone number for Brian Copans, his business is called BMC & Gee?
Thanks a lot!

 

Sent you a PM

 

Been there. My car has 60K miles and I am on my third set of trans. rubber mounts, two sets of stock and now stiffer ones from GMG. If anyone tracks their car and ends up having to replace these rubber bushings just upgrade to stiffer after market ones. I noticed better shifting from 3/2 and 2/3 coming into and out of slower corners easier to place with stiffer trans. mounts and stiffer motor mounts.

 

Plus 1 for Brian! Drove mine down from Chicago while on business, fed ex shipment back.

 

If the number I sent you doesn't work, let me know I have another.