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FB 5 Speed Shift Forks

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Old Jan 3, 2012 | 05:07 PM
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egertk's Avatar
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From: Lynnhood
Question FB 5 Speed Shift Forks

I just got done tearing down a spare FB transmission I picked up, went through and replaced all of the synchros and bearings, the shift rod ends (forks?) however show some wear and I'd like to replace them. Are there any options besides going through Mazda? The three rod ends cost about as much as all the bearings and synchros did. Can these be repaired?

Also, the actual selector forks, I'm used to seeing them use plastic or bronze pads at the end but there were none inside this box, I didn't see any in the diagrams I've been able to find but figured I'd confirm with folks who know before I proceed.

Thanks in advance!
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Old Jan 10, 2012 | 08:54 AM
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From: Lynnhood
Nobody has any advice on this one?
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Old Jan 14, 2012 | 05:19 AM
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rx7_FREAKKK's Avatar
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From: Dot Island
Originally Posted by egertk
Nobody has any advice on this one?
the question is basicly a non question. Anything can be replaced or repaired. its about money.

And if you replaced them why would they show wear? I think i know what you mean. Maybe you ment you replaced some parts. and other parts show wear. But the question is what have you replaced and what have you not replaced?
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Old Jan 14, 2012 | 05:24 PM
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From: Lynnhood
Sorry, guess I wasn't very clear with my initial questions wording. So I rebuilt the transmission but that only included new bearings and syncros. I didn't replace anything else, but I'd like to, the shift rod ends have over the 0.8mm of gap between them and the selector lever that's called out as the max in the service manual. I've also found that these are NLA from Mazda... so I'm looking into welding and then re-grinding them right now or the possibility that Miata rod ends and selector lever might work in their place. I was just looking for any other places that might sell these, Mazdatrix doesn't have them either...
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