depends where around the tranny the leak is
To fix a standard transmission leak on a 1993 Ford F250, simply take it to a mechanic.
Remove transmission and replace front seal.
replace O ring
No, thay have never made anything in a can that will fix something. If you add stop leak to your transmission it will mess up the seals and you will have to have the transmission rebuilt. It would be best to just fix the leak and a whole lot cheaper.
how can i check the transmmission fluid?
The transmission has a leak and it will soon go out if you do not fix the problem
Find the leak source and repair it. Usually the cause is cooler hoses.
If you run the transmission low on fluid you can cause damage. Fix the leak.
Buy a new transmission oil pan gasket before your transmission blows from leaking liquid.
J&B liquid weld Replace the line
It depends on where it is leaking. If it is the lines it is cheap. Anything else it is not.
$100-3000 depends on what is wrong.