Front seal: remove engine or transmission and replace the seal. Rear seal, remove the drive shaft to replace the seal. Unfortunately, you typically only have problems with the front seal.
drop transmission remove old seal replace with new seal
You must remove the transmission are engine to replace the rear main seal.
remove transmission, remove rear main seal, install new rear main seal, install transmission.
You will have to remove the transmission and torque converter from the car to get to the front seal.
remove the trans. and get a seal puller
Remove transmission and replace front seal.
under the bottom of the transmission remove the pan.
You have to remove the transmission from the vehicle, then remove the flexplate from the crankshaft. The seal is directly behind the flexplate.
To replace the front seal on a 1992 Ford Aerostar transmission, first ensure the vehicle is securely lifted and supported. Remove the transmission pan and drain the fluid, then detach the torque converter from the flex plate. Carefully pull the transmission from the engine and remove the old front seal using a seal puller. Install the new seal, reassemble the transmission, and refill it with fluid before reconnecting everything.
Remove the tire and wheel. Remove the axle end cap. Remove the axle seal with a seal puller. Reverse the process to install the new axle seal.
You will have to remove the transmission and pull the toqure converter out of the front of the trans. then you will see a seal in the center of the trans. Remove it with a screw driver, then clean and install new seal it will drive in with a hammer if your good. You may need a seal driver.