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5th gear grind

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Old 05-30-2009, 12:34 PM
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Default 5th gear grind

I have a 1999 Trans am with 116k on the clock. The car grinds into 5th gear occansionally, but doesn't do it all the time. I'm thinking it might be the syncro or possibly the sliding sleeve. I've never heard of a 5th gear failure. My car is putting down 400+whp and all the other syncros are holding up just fine. Anyone else have any suggestions?
Old 05-30-2009, 01:57 PM
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is it hard to get it back in to 5th when downshifting from 6th? does it do it only when cold, not when everything is up to operating temp?

if so, I have the same problem you have.
Old 05-30-2009, 02:27 PM
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Hey guys,

The 5th/6th gear is connected to the countershaft extension.

It's possible that maybe the blocker ring is worn a bit on 5th or the actual part of 5th gear that meshes with Synchronizer Assembly. The actual Synchronizer Assembly may also be worn too.

Here's a link for the T-56 manual.
http://www.fordmuscle.com/archives/2...-0610-0199.pdf


Perhaps changing out the tranny fluid might help for the time being.





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Old 06-01-2009, 03:46 PM
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well it locks out of 5th when downshifting from 6th. It only grinds when its put into 5th, and you start to let the clutch out. anyone have anymore ideas?
Old 06-01-2009, 04:52 PM
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Originally Posted by 09jyounger
well it locks out of 5th when downshifting from 6th. It only grinds when its put into 5th, and you start to let the clutch out. anyone have anymore ideas?

Click here ...
https://ls1tech.com/forums/11677960-post3.html




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