You dont...
The engine oil and gearbox oil are the same thing, so if you want to do this, then just do a normal oil change!
The 1991 Ford Probe does not have a transmission fluid intake reservoir. All of the transmission fluid is contained in the transmission.
Fluid is inside the transmission.
what kind of transmission fluid does a 1991 bmw 525i need
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what type transmission fluid uses for a 1991 ford probe
My 1991 Buick Century won't move or hold transmission fluid
A 1991 Chevy Camaro with a manual transmission needs Dexron II ATF fluid. It provides lubricant and cooling to the transmission.
1991-1996 Ranger automatic transmissions use Mercon type automatic transmission fluid.
Transmission fluid is always put in through the Tranny dipstick tube.
where do you add manuel transmission fluid on a 1991 geo storm 5 speed
The automatic transmission fluid dipstick is in the engine compartment , near the firewall , just to the passenger side of the engine . The manual transmission fluid level is checked under the vehicle at the transmission fill plug on a 1991 Ford F-250