My gearbox was rebuild incorrectly (went in only for the repair of the main shaft bearing). All I did is 10K miles and I developed similar noise as before. Rebuild-er didn't know his stuff which created some more damage.

This is the state of affairs now...

1. Reverse gear wheel (which changes direction) needs new bearing.
2. Small ball from the reverse gear lever fell from damaged spring into the diff housing. Need new spring.

Fine, will fix this.

I have some questions on how to proceed...

My tech says the main noise I have is the small 4 point bearing.

Fine, changing this too!

Then he discovered other things and here things get tricky and expensive..

1. Lever bearing is completely worn out: what are my options here? Can I change just the bearing? Tech says the real problem is bearing in the housing which needs to be changed. What does this mean? Why the real problem? He also says my detent from gbox is helping here...

2. AND THE REAL DILEMMA... What do I do here?

1st and 2nd gears are worn in the synchronization teeth he says. So the shaft needs changing as they are part of it.

My considerations...

My 1st and 2nd gears engage fine when car is warmed up. Perhaps they are a bit notchy when stone cold but when warm, perfect. I was told until cars warm up our gears are always a bit notchy especially with short shifters fitted - myth or fact? When I drive I never grind from 1st to 2nd or 3rd to 2nd.

So the real question is; DO I NEED TO REPLACE THIS SHAFT OR NOT? I presume unless I grind the gears the situation will remain in a status quo and with other things replaced my gearbox should run fine? Also, in another 100K I will probably need to replace main shaft bearings again. Wait until then and hunt for second hand shaft in the meantime? Or do I bite the bullet and get it sorted out 100% now...

Thanks.

Here are the photos. Detailed analysis and comments are most welcomed...

 

New info: My current tech says I need to replace the shaft, in order to fix 1st 2nd gear damage. Another tech says it is fixable with a press and can get just the gears for 89$ each? ??? Who is right, who is wrong?

 

WOW. The reverse detent most likely happened because the installer did not tie reverse and 5/6th shift rods together with the holder tool. Sorry to hear and see this. I do have a minty stock main shaft with matching 1&2.

 

He maybe is referring to just changing the syncro teeth?? This would be true for 3-6th gears not 1st and 2nd, they are welded on. 3-6 are pressed on.

 

You can not get new 1st and second gears. They are part of the mainshaft. Gears are also more expensive han 89$ each. more like 600-800$ each. i would replace the retaining plate to the gt3 part, looks like your shims are getting chewed up by the 4 point bearing. i have a stock mainshaft with 1/2nd gears laying around in my garage.

 

Man full moon? It's tranny bustin' season!

 

sounds like a line from an eddie murphy movie

all kiddin aside, this reminds me to ask you to thank lance for the job next time you talk to him... and your assistance as well. it's like butter

 

Sunset Porsche, call them for parts, they are cheaper than suncoast........

 

Here we go; all done and dusted. I am a happy camper again.

German Autobahn test; 327km/h (203.23mph) on the speedo - LEGALLY!

 

I hear you, I broke third gear Friday at Texas invitational. What is really frustrating is the fact that this was a transmission built by guards three years ago. I am kind of disappointed.

 

ya see them lil ball bearings? they turn to mush after enough heat cycles. that alone will get ya inside to look at other stuff..

glad ya got it sorted!

 

Sorry to hear that. I feel your pain mate, I really do!

 

So am I, believe me.

You are right about the the little bearings (the suckers)! My new tech told me they change the bearings every 2,000 race miles as a preventative measure. He says that for street (spirited driving) they usually last for about 100K miles. Well it looks I am slightly above the spirited street driving, as mine went at 90K miles the first time round.

My advice to everyone; MAKE SURE YOU TAKE IT TO SOMEONE WHO KNOWS WHAT HE IS DOING WITH THESE GEARBOXES!

You live and learn.

 

x'lnt point. mine went btw 100-110 k miles. 100k is right about where stuff just plain wears out. except the motor, thankfully

 

Except the motor you say; I honestly hope it stays this way because when the motor goes: