Behind the driver's seat in the floor. It would be the front left corner of the cab when viewed from the rear hatch.
Battery is located in the trunk.
Because it has to be replaced.
3.9Ltrs of 80w-90w grade oil
there isn't one
To find the transmission dip stick on the 1986 Toyota Celica, open the hood of the car and locate the battery. Near the battery, you'll see the left front part of the engine compartment. That is where you'll find the dipstick.
Buy a new one and you will see what all you have to take loose.
Linkage is probably sticking or seized
its in the gas tank
Follow the positive battery cable and it will lead to it.
Should be beside the battery.
in the tank
Is on the engine block on the upper water hose.