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Gearbox issue. 4 speed shifter shaft bent?


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Well I fianlly got mentally prepared to do more mechanical work today. Went to pull the old gearbox and clutch out and found that my replacement 4 speed's shifter shaft actually hits the guibo/rubber driveshaft joint donut. So it wont spin clean.


What the? Im guessing its been dropped? The seal is a little open on the top so it must be.


Can this be fixed easily using parts from my old one? Can I just take the back off both boxes and swap parts? 





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Also realized the input shaft on the gbox has a bit of play. Maybe 2mm worth.


my old gearbox makes all kinds of noise but i think its only the release bearing.


can 2 boxes be turned into one by a novice? I really dont want to get too deep into gearbox rebuilding!



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With much sadness,

I must say that getting a 2002 gearbox apart is not easy.

The rear 'cover' is actually the carrier for the back of the main and countershaft,

AND all the shifting mechanism.


With further sadness, I must say that getting a 2002 gearbox BACK TOGETHER

so that it works is much harder than getting it apart.


Wish I had better news...




"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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As Toby said taking gearbox apart isn't easy job and putting back together requires precision measuring equipment, etc. I have taken mine apart and replaced all bearings. Assembly is one shot deal and if does not work afterword then you have start allover again. 



76 2002 Sienabraun

2015 BMW f10

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Was that a BMW guibo or not?  My experience with guibos is that even the quality brand non-BMW ones expanded as they aged and would hit the shaft.  After going through two defective non-BMW guibos I finally paid the money for the real part and never had issues again.

Matthew Cervi
'71 Bavaria

'18 M2

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Thanks Guys. Matthew yes I will definitely try. I thought it may be out of whack its only every 2nd or so part of the guibo that hits, so likely its distorted.


When the torrential rain in NY stops Ill get back to it! Cheers. Will post update when I have the new flex.




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4 hours ago, Mike87 said:

Also realize that if the guibo is not fully bolted in (all 8 bolts) it will be larger in diameter than when it is in its free state.

I am voting for this, especially after you mentioned it is just every second bolt hole.

1975 BMW 2002 Fjord

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