Same place you check it.
IN the transmission.
check the owners manual there is a section inside the manual saying how much of oil, transmission fluid, brake fluid ect..
Mercon
how to check the fluid on a ford freestyle transmission
dexroniii/mercon
Meron, ONLY!
Through the dipstick tube where the indicator inserts. Be sure to have the car warmed up, running at idle, in park when you check the automatic transmission fluid.
how to check the fluid on a manual transmission for a 1989 ford probe gt
left side close to firewall
Remove transmission oil pan for acces to filter Replace fluid, filter, and gasket
Down the tube that holds trans dipstick.