Bruce In Philly

Are you sure they used PTX? Check your slip... it may say Delvac. Let us know... oh, and how much did they charge for parts and labor?

Peace
Bruce in Philly

Bruce In Philly

Do you really want to do this all the time? Or worse, intermittently? It is only going to get worse.

Peace
Bruce in Philly

shekmark

jeebus31

My 997.1 C4 suffered this issue early on when I first bought it. Changed the oil to PTX and it was essentially fixed. Unfortunately, not long after that my trans was replaced with a brand new box from Porsche. The new box, filled with PTX, also sometimes jams trying to go into first, but very rarely (once or twice in 3 months). So in my opinion, it's probably a characteristic of the Aisin box and we should probably be doing fluid flushes more often than the recommended 120k miles/10 year interval.

Bruce In Philly

FYI: On a whim, I just contacted GBox.... and asked them about the 1st gear jam... they gave me a short response that said "oil change interval should be every 36K miles". They didn't explain, just this. This interval fairly matches my experience getting the jam. Anywho....

Shekmark..... why do you want to drive around and be annoyed? There is a high probability you can make the issue just go away. For me, I can't stand stuff like this. It starts out as annoying, then it gets downright dangerous particularly when driving in that wonderland of genteel, kind, and patient citizens called "North Jersey". If you get just a horn after a red light, you are lucky.

http://www.gboxweb.com/

Peace
Bruce in Philly

Para82

What prompted Porsche to replace your gear box?

jeebus31

Worn synchros and bad output shaft bearing. It was replaced under Fidelity warranty.

Fined

Wow so all this talk about PDK and here we have a regular manual gearbox getting replaced...

mikemessi

When sitting at idle and clutch out in neutral the clutch and mainshaft are spinning at 750 RPM. If you wait for light to turn green then try to quickly depress clutch and put into gear the synchros won't alllow it. The key is to push in the clutch then count to 3 before trying to put it in gear. This allows the clutch and mainshaft to slow down and allows engagement into 1st which is not spinning when car is stopped.

mikemessi

And the key to getting into first when coming to a stop sign is to slip it into 1st at about 3 or 4 mph just before you stop. That is the speed the car goes in 1st gear at 750 rpm (idle) and the clutch speed and mainshaft speed are synchronized.

mikemessi

And it's my understanding the throw out bearing on modern 911s are very robust and there is no harm sitting at a stoplight with car in 1st and clutch depressed. Your clutch should wear out way before the throw out bearing. And bearing typically gets replaced when clutch is.

sandwedge

And how many threads on this same subject? Seems like at a minimum a monthly topic. One not long ago that went on to 30 pages or something. Another current one going on as we speak: https://rennlist.com/forums/997-foru...irst-gear.html

Racetwin2

I read somewhere that synchros on 1:st and 2:nd gear is made from brass on our 997:s and not steel as for all other gears. Maybe that is why we have issues with first and second? Helps with PTX but does not solve it 100% in my case. When transmission is warm it's 95% problem free now.

Para82

Wow first i've heard of this, if you don't mind sharing were there symptoms? Any indicators?

shekmark

Bruce, thankfully I am not in north Jersey. I think that should be a different state! LOL I'm in central, a little northeast of you, and it is a fair amount better here. This thread has prompted me to make an appointment and change to PTX. I have only been stuck out of first a handful of times but it is routinely sticky going in.