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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...

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โˆ™ 2011-09-13 14:52:53
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Q: What type of fluid goes into a 4 speed manual transmission on a 1991 Ford F 150 night with a 5.0 V8?
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