what can happen when adding too much, like say around 3/4 of a quart to maybe a full one? this is for an m5od (5 speed), and it takes mercon v..

well anyway, it would make a grind/huge vibration sound while in gear. driving, or when the clutch is applied with the shifter still in gear, and would stop if i took it out of gear and hit the clutch again. it was like a huge amount of vibration in the shifter and made it impossible to shift until i hit the clutch again. usually it only happened in 1st or 2nd, coming to a stop. also made a loud bubbling sound. i had the boot off earlier in the day fixing the shifter bushing, thought that was causing the sound and it wasnt, so i bled the clutch. shifts pretty damn good but still made the sound/vibration. couldnt think of what happened so i went to make sure the fluid was at the right level, and as soon as i took the plug off, it came pouring out all over the driveway and all over my arm so i let it drain mostly out, i was in a hurry to make it stop so i could clean up my mess, so i put the plug back in. drove it, and it no longer makes the sound... now is this possible, could adding too much cause the grinding/vibration?

 

by the way, im asking because i was told it probably wouldnt cause that to happen

 

I think some noise, excessive heat, maybe the bubble noise... but I don't see it causing excess vibration or hard shifting.