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It's definitely an M5R2 (aka M5OD).
It's not uncommon for the shift fork to go out, if the tranny was working fine previously to that failure...I'd simply replace the worn parts and flush the tranny with fluid. Fill it up and run it, if it works fine then off ya go. If you still have problems than something else is wrong.
Then I'd change it within 50 miles and leave it as long as there are no other symptoms.
I'm meticulous about any metal debris that could be in the tranny from the shift fork so I personally would fluid the fluid and make sure it's clean.
Yep, its an M5OD. The forks can be replaced by just pulling the top cover and sliding out the shift rail. Pretty simple.
Worn forks are almost always the result of a driver that won't keep his hand off the shifter. If you rest your hand on the shifter between shifts you are wearing out the shift forks.
The other thing that can cause worn shift forks is a bad pilot bearing. If the pilot bearing is dragging then it requires more effort to shift (as additional pressure is required on the synchro ring to spin the gear up - and you therefore wear the synchro ring too) and that wears the fork. So while you have the transmission out to change the forks, inspect the clutch and pilot bearing. Replace as necessary.
I have the same trans. just had mine out to do a new clutch and slave and pilot bearing. swapped out the top of the trans for a top that was recently rebuilt.
Since I put the trans back in everytime I let off the throttle it starts grinding and wanting to come back out of gear it never comes back out of gear completely. I either throw it in neutral or hit the throttle.
I pulled mine back out last night and pulled the top back off and dont see anything wrong with it so I dont know what to do with the dang thing
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