IF you have over filled the transmission this will cause it to bubble, this could cause serious damage, drain and refill with the proper ammount.
Either the transmission is overfilled or the transmission vent is plugged.
transmission cooler
If too much transmission fluid is added, or there is something wrong with the pump
Common causes of transmission fluid leaks:Worn Transmission Pan SealsWorn Rear Main SealCracked Transmission Fluid LineLeaky Torque ConverterLoose Transmission Pan Bolts
Most likely causes are low transmission fluid level, dirty transmission fluid, or clogged transmission fluid filter.
check your transmission fluid, if it is low it will slip
Fluid is overfull, or there is water in the fluid.
The primary cause of a transmission to experience hard shifting is low fluid. Fluid is the life of a transmission and operates most of its functions.
Possibly low fluid.
seal. expensive
Bad seal? Bad cooling line to radiator?
no tranmission fluid in it or it maybe your tranmission is bad because you keep grinding your gears up but for a automatic its your transmission fluid