In short, bad things will happen. The ATF foams due to the high level,
which causes damage to the transmission and possible leakage around the
seals. Be very careful when changing ATF - there have been several recent
posts in this news group regarding the appropriate temperature, level, etc.
for checking and changing ATF.
The correct fluid level is BETWEEN the H and L mark on the dip stick.
Check the level when the transmission is hot from driving about 5+
miles. The motor should be idling, the car parked on a level site and
the transmission in N or P.
Too much (or too little) is not good. Too much gets aerated by the gears
air bubbles get into the fluid which can cause the transmission to slip;
too little fluid also allows air to be pulled into the hydraulic system
causing the same.
Well it probably wont kill your transmission but,
it could build up to much pressure and you could
blow out one of the seals. Once you push out a little bit of fluid through a
seal, you will probably always have a leak there to some degree or another
until you replace it.
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