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4th gear poping out, Evo 10 manual 5 speed

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Old Jul 13, 2017, 01:15 PM   #1
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4th gear poping out, Evo 10 manual 5 speed

Hi everyone,

Like mentionned in the title, I am having problems with my gearbox. I have a 2014 evo 10 gsr with 5 speed gearbox, stock power. I drive the car weekly and do a bit of track.

On the way back home from the track my gearbox jumped out of 4th gear 3 times. This happend under low load and high load but I can't find a patern, it just jumps out when it feels like to. This is the second gearbox I am having problems with and I don't know why.. (well I do, must be tracking the car !) But why does it wear out soo fast ? Does anybody have this problem?

I am having trouble to find any info on this. I only seem to find people wearing out there gearboxes on 500 hp track cars. I'm a fairly smooth driver and I don't thrash the gears like a madman. Can anyone shed some light here please ?
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Old Jul 13, 2017, 02:37 PM   #2
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It definitely shouldn't be happening. Only course of action is to tear it down and see what's going on.
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Old Jul 13, 2017, 03:23 PM   #3
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Yep as stated above the trans needs to be removed and opened for further inspection. Usually its a damaged synchro slider. But many possibilities.
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Old Jul 17, 2017, 12:50 AM   #4
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Thanks for your reply guys ! But does anyone know why this is happening? And has anyone had this problem allready?
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Old Jul 17, 2017, 10:20 AM   #5
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It's either an issue with the shift fork, selector sleeve, or the selector sleeve springs.
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Old Jul 21, 2017, 05:15 AM   #6
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Is it possible that the oil used in the box could cause a problem ? It's motul gear 300 75w90 ?
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Old Jul 21, 2017, 10:20 AM   #7
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That oi l shouldn't cause an issue. That's actually what TRE recommends for gear boxes.
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Old Jul 25, 2017, 12:55 AM   #8
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Yep, same happened to me, bought my 08 gsr from a dealership "fast n furious won't last long" �� anyways turned out they replaced the clutch but apparently forgot to fill up the trans with fluids. 4th gear started poping out 20 miles in. Synchro slider got damaged bad so did 2nd gear.
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Old Jul 31, 2017, 08:57 AM   #9
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Could it be anything to do with the clutch delay valve and the fact of double clutching ?
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Old Jul 31, 2017, 10:35 AM   #10
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It is easier for the trans to come out of gear if it's no fully loaded due to clutch slipping.


Is it popping out right after a shift?


However, one would expect an issue with the clutch to effect all gears.
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Old Aug 3, 2017, 05:17 AM   #11
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If it pops out (doesn't happen all the time) it pops out straight after the shift..
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