For the MTX-75, the only fluid that is factory-recommended is Ford's Full Synthetic Manual Transmission Fluid, spec WSD-M2C200-C, part number XT-M5-QS (quart) which replaced the 80W manual tranny fluid.
Mercon V is NOT recommended for ANY Ford manual transmission as of 2005.
Reference:
Motorcraft Manual Transmission Fluid Recommendations
XT-M5-QS is recommended as the replacement service fluid for all MTX-75s going back to 95 regardless of what the left the factory with.
Steve
