Transmission problem with 2nd/4th gear selection, why does this happen right before a track day!!!! Options

[racerx9146]

Hello, I could use a little input on this one.

So less than 11 days to a non-refundable track day at Thunderhill and my tranny won't go into 2nd or 4th. I have disconnected the linkage and cannot engage 2nd or 4th manually. 1st, reverse, 3rd and 5th are fine. It's like there is not enough throw at the side shifter input dongle. It also seems to require a lot of throw to get 3rd/5th engaged to the point that the ball is starting to pull the bushing out of the socket.

Its a 914-6 transmission rebuilt and converted to side shifter by a local Porsche "specialist". About 9 years ago. My tranny has never shifted right since the rebuild and I kept telling myself it was the linkage or something else. Now the problem has presented itself completely! 4th was always "soft" but now its not there at all and 2nd has joined the party. No grinding just no engagement. The car was in project stage for long after the work was done so it tough to try to bring it back to the specialist.

Got any ideas, Is there anything I can adjust with the tranny in the car or should I pull immediately and try to figure it out. I have rebuilt Porsche engines but always stayed out of the transmission world.

thanks Daron

[PRS914-6]

Here is what you have in there......Sounds like it's teardown time. I would first pull the cover\dongle off and take a look through the hole

[Dr Evil]

Here is what you have in there......Sounds like it's teardown time. I would first pull the cover\dongle off and take a look through the hole

Your pinion shaft bearing is on backwards (IMG:style_emoticons/default/wink.gif)

[PRS914-6]

Your pinion shaft bearing is on backwards (IMG:style_emoticons/default/wink.gif)

Normally there is no "backwards" on a straight roller bearing as there is no thrust. However there are advantages to locating the weakest part of the roller cage away from severe oil spray

The factory manual shows it is assembled correctly....... (IMG:style_emoticons/default/wink.gif)

[Dr Evil]

Your pinion shaft bearing is on backwards (IMG:style_emoticons/default/wink.gif)

Normally there is no "backwards" on a straight roller bearing as there is no thrust. However there are advantages to locating the weakest part of the roller cage away from severe oil spray

The factory manual shows it is assembled correctly....... (IMG:style_emoticons/default/wink.gif)

The factory manual shows it in the orientation see in 912 and 911, or more clearly in the OLD transmissions. By the time they made the 914/901 they flipped them. Yes, it doesnt matter from a straight roller bearing stand point, but when you install the stack into the case and catch that small cover on the bearing and it pops off of your $200+ bearing, you will see whey they switched to facing the cage cover forward (towards the diff). But, what do I know (IMG:style_emoticons/default/rolleyes.gif)