It is not the same as the 90w used in the rear axle.
Some say that the Ford reccommended transmission oil for a '91 4-speed is an 80w gear lube.
Amsoil reccomends their XL 10-40w synthetic.
I recall 50w being specified for my old '67.
Red Line offers specifically formulated manual transmission gear lubes.
The Red Line MTL 70W80 GL-4 Gear Oil (SAE 5W30/10W30 engine oil viscosity) is designed for use in manual transmissions. ("its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting")
Red Line also offers MT-90, this is a 75W90 GL-4 Gear Oil that's slightly heavier than MTL.
The Ford 5-speeds call for ATF.
Interesting to say the least...
Honda Manual Transmission Fluid is recommended for a 5-speed manual B16A motor. Amsoil Manual Transmission Fluid will also work in a 5-speed manual B16A motor.
type of fluid for 5 speed manual transmission
Motorcraft MERCON automatic transmission fluid in your 5 speed manual transmission
Motorcraft MERCON ATF ( automatic transmission fluid ) is used in the 5 speed manual transmission ( according to the owners manual )
The T5's (5 speed manual) use ATF. Yes I said Automatic Transmission Fluid.
Motorcraft MERCON automatic transmission fluid is used in the 5 speed manual transmission ( according to the Owner Guide )
The owners manual for the 1999 F150 shows Motorcraft MERCON ATF ( automatic transmission fluid ) for the 5 speed manual transmission
The transmission fluid capacity for a 1991 S10 5 speed manual transmission is approximately 3 quarts. This can be purchased at any auto parts store.
Motorcraft MERCON automatic transmission fluid is used in the 5 - speed manual transmission in a 1996 Ford Explorer
According to the 1997 Ford Ranger owners manual : Motorcraft MERCON automatic transmission fluid is used in the 5 speed manual transmission
what kind of transmission fluid does a 5 speed manual honda civic take?
The 2002 Ford F-150 owners manual shows ( 3.75 quarts ) for the 5 speed manual transmission and to use Motorcraft MERCON automatic transmission fluid in the 5 speed manual transmission