bad seal, the transmission is under your car by the road itself, if the seals are bad, water dirt and other debry and can penetrate (bad)
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∙ 13y agoFluid is overfull, or there is water in the fluid.
transmission cooler
If too much transmission fluid is added, or there is something wrong with the pump
change the fluid after finding where the water comes from water will cause rust in the transmission if left in
Common causes of transmission fluid leaks:Worn Transmission Pan SealsWorn Rear Main SealCracked Transmission Fluid LineLeaky Torque ConverterLoose Transmission Pan Bolts
Usual cause is a bad radiator, the coolant and trans fluid mixes in a failed cooler.
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
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.
When you changed the Radiator did you flush the engine to remove the transmission fluid that the already mixed with your water in the engine block. If not that would explain the presence of the fluid in the coolant holding tank.
Possibly low fluid.
seal. expensive