The best thing to do is to take it to a repair shop that has a transmission flushing machine. That will change all of the fluid in the system.
An automatic transmission on Ford Ranger holds three quarts of transmission fluid. That is after you drain all the old transmission fluid out.
For a 1994 Ford Ranger, the manufacturer's recommendation is DEXRON-MERCON automatic transmission fluid.
Remove the Ford Ranger automatic transmission drain plug. The drain plug is in the bottom of the transmission. Allow the oil to drain out and replace the plug. Fill the transmission with new transmission fluid.
The transmission fluid capacity for your truck, automatic transmission would be 3 quarts.
1991-1996 Ranger automatic transmissions use Mercon type automatic transmission fluid.
Motorcraft MERCON automatic transmission fluid ( also , the fluid type should be stamped on the automatic transmission fluid dipstick )
Manual transmission fluid is MERCON automatic transmission fluid.
Motorcraft MERCON automatic transmission fluid for 5 - speed manual transmission ( YES - ATF ) Motorcraft MERCON V automatic transmission fluid for the automatic transmissions
The type of automatic transmission fluid to use is stamped on the automatic transmission fluid dipstick according to the 1997 Ford Ranger owners manual
In a 2001 Ford Ranger the automatic transmission fluid requirements will be indicated on the automatic transmission fluid dipstick or the handle ( Motorcraft MERCON - V according to the Owner Guide )
1993-1996 automatic transmission: MERCON automatic transmission fluid (NOT MERCON V) 1993-2005 manual transmission: MERCON automatic transmission fluid (NOT MERCON V)
( Motorcraft MERCON V ) automatic transmission fluid according to the 1998 Ford Ranger owners manual