355 Lever stuck in 3rd gear. Found the issue. *pictures*

Wow, didn't know those could fail. Should be an easy fix, adjusting the shifter can be a little tricky the first time.
I replace that seal on my car when I first got it, this was quite a few years ago, but I don't remember it being difficult at all. Carefully remove the old one, gently tap in the new one

 

Thanks for posting. I have not replaced the seal you are asking about.
I am interested in whether your work does reduce that high RPM buzzing from the shift knob, it’s bothered me since day one, but not enough to do anything about it. Once you figured that the bar buffer was your problem, can I ask, how long did it take you to get them out of the car?

 

It takes less than 10 minutes to get that bar out of the car if the panels are removed already.

There are several causes for the shifter buzz rattle. I think the most common is either a slightly misaligned shifter, and/or a worn bushing in the actual shifter housing that allows the shift rod to rattle against the gate.

They're also is a rattle that sometimes occurs when the shift rod slightly taps the hole in the frame.

I have a YouTube video on my channel of how to rebuild the shifter housing. It's not too hard

 

Thank you Ken, watching now.

 

Interesting to see the construction of that part -- didn't realize the studs don't pass all the way through the rubber. Were the nuts holding the sandwich together loose? Looks perhaps as if it wouldn't matter if the studs come loose from the rubber block if the sandwich was tight?

 

Shifter rattle inside the car is also due to the shifter bushing 127446. You'll need to remove the entire shifter/gate assembly to replace the $20 plastic shifter bushing.

 

The shift shaft seal (146306) inside the rubber boot is easy to replace on a manual transmission 355 but more complex on a F1 as the actuator has to be disconnected and can require a SD computer to realign afterward. For some folks, the first sign that the seal needs replacement is when the motor/transmission mounts being to sag and the rubber boot rubs against that crossmember which creates a hole allowing the fluid to drip out. This might be helpful: https://www.ferrarichat.com/forum/threads/anyone-have-this-transmission-leak.265985/

 

Thank you for the idea. Much appreciated.

 

I had the exact same problem, limped home in 3rd and impressed it had the torque to roll around only in 3rd.

Not surprising since rubber gets old it inevitably will start to dry rot and disintegrate. A poorly designed part really, should have just been a bush sandwiched between 2 bolts instead of studs cast into rubber.

 

I never thought this part would fail. I replaced mine last year as a matter of course to try and obtain a rattle free and smooth shifting action in combination with the new bushing, re grease and shift gate alignment.
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Luckily you were in third when it broke. It would have been interesting driving all the way home in reverse

 

Done in situ and just remove those parts by themselves, didn't mess with the linkages.

 

It’s pretty easy to get it into neutral by feel. It self centers once in neutral you need to turn it left or right and forward or back to get a gear. Having not much experience I was worried id not get it right, but once under the car it’s pretty easy to determine whether it’s in neutral or not.

 

The in and out being hard (forward and back) is you selecting a gear. In between that is neutral.

 

The same issue happened to me last week. Replaced those buffers 2 years ago... Both times the buffers failed at high engine load. Engine mounts look good so I'll have the gearbox mounts done this time.

 

I was attempting a 4th-5th shift when it happened. Technically the buffers can sheer off in any gear of course. In my case it keeps happening under high RPM situations, when the drive train is twisting and presumably torquing the shifter linkage. Bit of speculation there, but since my engine mounts are good I can't think of what else would cause this? I dropped the car off at a local shop to do the tranny mounts, should have it back next week.