HarmonyJim

All told, including out & in of the transmission by my independent tech, the Guard internals, complete new clutch pack, and about $700 in shipping charges…about $11-12k.

Brian Himmelman

do u have 997.1 RS OEM clutch and flywheel or upgrades 4.0RS kit? if yes did u add a damper or no? thank you

HarmonyJim

I used the 4.0 PP and spring clutch disc, with my oem 997.1 flywheel. No damper for me as I didn’t significantly lighten the rotating mass. The changes, along with the 997.2RS shifter and Numeric cables, really transformed the car. I also have the firmer transmission mounts. Calif Motorsports in Lake Havasu, AZ did the work, and I am very happy with it.

Brian Himmelman

Any exhaust mod to go with the above? Thank you

Brian Himmelman

did you get the part number for the r&p and the 6th gear? Can you share thank you

Broncozx

I found 2 numbers. For the 6th gear

First seems to be until -09, 996 302 955 50 , z= 34:37 , equals to 0.92

Second , 10- , 997 302 956 90 , z= 36:41 , equals to 0.88

But i dont know if that is for a rs.

Maybe we need to see in the motorsport catalog.

R & P , 997 302 911 90 , 3.89:1

Brian Himmelman

PERFECT, the 6th gear and R&P number match my order !! Doing 1st and 2nd synchro rings as well …cheers

drola

I am considering doing this on my 997.1/3
Quick question though - looking at the parts diagram I see that all the 997/3's use a 9 tooth pinion and only the ring tooth count differs between the gt3 and rs.
Does that mean that they all us the same pinion? It would be much easier to only swap out the ring. Would not need to take the box apart, only the diff. Of course to change the 6th gear I would have to take it apart.
Anyone know the answer to this?

De Jeeper

No that is not how ring and pinions work. The 2 parts r matched through the machining process and must be swaped together.

drola

Did you use the RS 6th gear? What kind of cruising rpm's are you getting in 6th on the highway? I'd think with the 4.0 the revs are probably pretty high

Makes total sense

Broncozx

I had a look into this gearing with a gear ratio calculator.

I have a 997.2 gt3, with rs end gear.

So my 6th is 0.92 . If i would do rs, which is 0.88 , the rpm would only drop about 200 , when doing 75 mph.

The turbo has 0.79 , and then i would be at 500 rpm drop , which seems better to me.

And the gt2 have a little lower than the turbo.

Brian Himmelman

mine is being sent away for r&p 3.89 and 6th gear … can u pls explaine the 2nd gear intent so I can let them know to do this as well, just don’t know exactly what to tell him to do or what parts … much appreciated

powdrhound

There is no 2nd gear detent issue on these gearboxes. Some of the pre-2003 Turbo G96 gearboxes were machined and shimmed slightly wrong from the factory and were subject to 2nd gear off throttle pop out. None of the GT2/3/Cup gearboxes have this problem. There is nothing you need to do regarding this.

Brian Himmelman

Much appreciated … I am super jacked to feel this shorter ratio gearing change to go with Dundon D4 kit
… had just Dundon headers but stronger Cdn dollar, Black Friday sale and a few drinks bam pulled the trigger … was able to get Guard LSD clutch pack but not the ramps (not available) as engine is out … coolant lines pinned, RMS done … anything else can think of or suggest while engine is out? appreciate the advice thanks

powdrhound

If the car is used for heavy track use, installing the 996Cup 3/4 shift fork is a good idea. I had that installed in my track gearboxes. The Cup shift fork is stronger as it's billet steel versus cast steel for the street part. About a $500 part available through Porsche Motorsport. If it's mainly a street car, I wouldn't worry about it.