You may be burning the fluid and not leaking it so replace the filter also check the TPS and coolant sensor
can you use a transmission from a 1993 ford ranger in a 2000 ford ranger?
no.
the governer is inside the transmission.
Yes
yes
Cracker Jacks.....
yes.
For a 1993 Ford Ranger , 5 speed manual transmission : ( trans code " M " / Mazda ) It takes 2.8 U.S. quarts of MERCON automatic transmission fluid
Manual transmission fluid type ....... MERCON automatic transmission fluid. - Haynes Manual #36071 - 1993-2005 Ford Ranger Pick-ups.
If it's a stock transmission, the shift linkage is mechanical.
According to Haynes Repair Manual #36071, 1993-2005 Ford Ranger pickups, all models: Manual transmission fluid type is MERCON automatic transmission fluid.
synchonizer worn in transmission