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Odd shifting issue

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Old Aug 2, 2016 | 12:32 AM
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From: Moore OK
Default Odd shifting issue

Well I've had the car together for a while and have been sorting out the tune and I have it where I'm comfortable beating on it some. Trans is a stock replacement with a Spec single disc. It shifts like butter, no noise, clunk etc UNTIL I'm at 5K or higher and then it acts up. No grinding, clunk rattles or any of that mess. It's not a synchro issue (been there done that). It just feels really stiff and doesn't want to go into gear.
I've tried shifting differently than I have since owning the car and nothing works.
It just feels like a rubber stopper is in the way of going into each gear.

I've bled the clutch multiple times
I've adjusted the shifter numerous times (same shifter as before)
Linkage is a brand new GM part
Trans is bone stock.
Tune never changed except for fueling changes after switching to E85.
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Old Aug 2, 2016 | 06:47 PM
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From: Boise
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Bad master cylinder (clutch)? I had an OEM one that was brand new from GM with problems back in the day
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Old Aug 2, 2016 | 10:13 PM
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From: Moore OK
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Originally Posted by Milan
Bad master cylinder (clutch)? I had an OEM one that was brand new from GM with problems back in the day
I'm sorta kinda leaning that way as it's the stock one. But it doesn't feel like a hydraulic issue, it's hard to describe. Especially when I've never owned a stick car that had a master go bad.
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Old Aug 9, 2016 | 03:16 AM
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From: Wa
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Sounds like what my car was doing,then all of a sudden it was stuck in gear,could not get it to release. I finally pulled the clutch today and found one of the 6 springs on the clutch disc fell out and caused the clutch to not release.
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Old Nov 11, 2016 | 09:43 PM
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From: Moore OK
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Well I finally made some time and replaced the master cylinder with a stock one. It feels much better, but 2nd and third still feel the same over 5K. I should have done the drill mod but I spaced out and forgot to while the line was off.

Any ideas?
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