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What transmission fluid/gear oil for 1969 three speed?

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Old 07-19-2014, 07:15 PM
Missin'A Gear Missin'A Gear is offline
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What transmission fluid/gear oil for 1969 three speed?

I got a 69 F100 with a 302 and three speed column shift. To ease the wear and tear of being a daily driver I want to flush the fluid and replace it with some clean stuff. I know that these older tranns often took gear oil over what we have today, but my question is what do I need for my transmission (I don't know the model name)?

I tried searching the web but did not come up with anything decent. Also, the guy at my local auto parts store said that I should not fill it up to the same level as a newer transmission. Solid advice or small town mechanic B.S.?

Many thanks.
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Old 07-19-2014, 07:46 PM
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80w90 gear oil for a manual trans... that's what you mean by "column shift", right?

Automatics require Type F is it has not been rebuilt. If rebuilt since 1990, then consider a synthetic.
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Old 07-19-2014, 07:55 PM
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Originally Posted by HIO Silver View Post
80w90 gear oil for a manual trans... that's what you mean by "column shift", right?

Automatics require Type F is it has not been rebuilt. If rebuilt since 1990, then consider a synthetic.

Yeah three on the tree. The truck is 100% factory original, including gear oil.
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Old 07-19-2014, 09:18 PM
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75w90 for the three speed, but the four speed did call for 50wt motor oil. 15w40 diesel rated oil works great too, as long as it doesn't leak and you change it about every other engine oil change. If you want to keep it gear oil, synthetic will give easier shifts and slightly better mileage.
Fill it to the bottom of the fill plug hole, why you wouldn't want to fill it to the factory recommended level is beyond me.
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