A pan gasket failure can cause a leak; other seals are subject to failure over time
check your transmission fluid, if it is low it will slip
Possibly low 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.
Most likely causes are low transmission fluid level, dirty transmission fluid, or clogged transmission fluid filter.
Low transmission fluid Overheated fluid, too low capacity or a blown tranny If it is a manual, you might wanna replace the clutch.
could it be low fluid
Most often, low transmission fluid.
Transmission fluid will show full when it is cold, but low when it is hot if it is low on fluid. Transmission fluid has to be checked when the car is warm.
Low transmission fluid will cause this and also weak bands inside the transmission can cause this.
The most common cause of a automatic transmission jerking, when shifting, is low transmission fluid. Fill the transmission to the full mark.
A sign of low transmission fluid in a vehicle is the gears not shifting properly. Transmission fluid can be checked to determine the level of fluid in the vehicle.
The bands may be weak, it may be low on fluid.