have a 2005 8 mr, currently am locked out of 6th gear, and some gears only work when im at low rpms or stopped for example first only works when im stopped, 2nd and 4th work great 5 works when it wants to.. transmissions trashed anyone can shine some light on this it would help seeing that the dealership is already going to tell me if they are going to warranty it which i doubt

 

Have you tried adjusting the clutch pedal engagment since you got the ATS twin carbon?

 

no, i was told that if it was adjusted wrong than the problems would have occured immediately after i starting driving it when the clutch was put in

 

Sorry to be the bearer of bad news, but you will probably have to replace the 5th and 6th gear or worse. You might have to replace the whole output shaft assembly because of the engagement issue with the other gears. But it is not related to the clutch install and you should not have to pay out of pocket. The problem with the 6th gear is possibly due to a 5th gear grind which distorts the gear and does not allow the sleeve to pass over to 6th gear way disallowing the gear to be engaged. (I think that it's called the sleeve)
Good luck with everything.

 

mitsu transmissions are know to suck.
almost all 03-04 evos have 5th gear problems
just make you car stock and take it in to get it warranteed

 

good news, it was just my linkage an they are warranting it, i strecthed or tore them or something. so car will be fixed in a few days

 

Technically, its not a Mitsubishi tranmission. The 6 speeds were manufactured by a company under Toyota.

To the original poster: Try adjusting the clutch pedal engagement. Also try swapping in some fresh OEM 6 speed gear oil. If neither of these two things make a difference, you probably have a synchronizer problem, and need a rebuild.