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Old 11-05-2018, 04:38 PM   #1
37 Coupe
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Default Transmission oil,I searched

Okay before I get a lecture I did search under transmission oil and 600wt and nothing.So if you don't want to answer could you at least tell me what key word will get me there? All I want to know is this.I am rebuilding the transmission right now on my '31.Basically pretty good shape except bearings which I have ordered and the "O" ring shafts for cluster.So with all this new stuff should I use the 600 wt.that Brattons and others sell or a good say summertime gear lube like I use in my '37 Ford.thanks for not berating me in advance.
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Old 11-05-2018, 04:43 PM   #2
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Default Re: Transmission oil,I searched

Use the 600w oil. The thicker the oil, the more your gears will slow down between shifts.

Some owners use 50/50, 600w oil and STP. I happen to do that also. Enjoy.
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Old 11-05-2018, 05:01 PM   #3
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Default Re: Transmission oil,I searched

Quote:
Originally Posted by WHN View Post
Use the 600w oil. The thicker the oil, the more your gears will slow down between shifts.

Some owners use 50/50, 600w oil and STP. I happen to do that also. Enjoy.

Me too. 600 wt and STP. No grinding.
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Old 11-05-2018, 05:11 PM   #4
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Default Re: Transmission oil,I searched

600W, 140 or 250 will work fine. I prefer 250.
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Old 11-06-2018, 10:03 AM   #5
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Default Re: Transmission oil,I searched

Thanks for answers.I am glad I decided to go through the transmission, gears all good bearings not so good.One caged bearing inside cluster gear was broken and in pieces. No spacer was used and two long cage bearings in place instead of one short on.Supposedly this will work but entire end was worn off one cage and bearing came apart tearing up hardened shaft. You never know until you look.
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Old 11-06-2018, 10:42 AM   #6
Jim Brierley
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Default Re: Transmission oil,I searched

I recommend modern oils in everything, why would anyone not take advantage of the latest technology? I use 90 wt. from NAPA.
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Old 11-06-2018, 11:49 AM   #7
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Default Re: Transmission oil,I searched

Jim,be careful where you use that modern oil,you do not want to put it in a older car with brass synchronisers it will eat them up,got to use mineral oil in my 57 Studebaker,no sulfur content.
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Old 11-06-2018, 12:20 PM   #8
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Default Re: Transmission oil,I searched

I use the 600w in everything but the engine, radiator and gas tank.
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Old 11-06-2018, 03:31 PM   #9
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Default Re: Transmission oil,I searched

I use Lucas Oil Stabilizer in transmission. Very noticeable difference in feel of gears when shifting VS 600W. Also gears synchronize quicker.
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Old 11-08-2018, 11:09 PM   #10
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Default Re: Transmission oil,I searched

When I search 600W I get 20 pages of posts. (https://www.fordbarn.com/forum/searc...p=25) Remember it is NOT 600wt as in weight it is 600w as in the product line that Mobile oil sells.
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Old 11-09-2018, 09:59 AM   #11
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Default Re: Transmission oil,I searched

Quote:
Originally Posted by rocket1 View Post
Jim,be careful where you use that modern oil,you do not want to put it in a older car with brass synchronisers it will eat them up,got to use mineral oil in my 57 Studebaker,no sulfur content.
I've heard this myth for many years and don't believe it. I've also experimented w/various gear oils w/brass pieces, in jars, sitting for extended periods and never saw any signs of the brass being "eaten".
YMMV
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Old 11-09-2018, 12:26 PM   #12
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Default Re: Transmission oil,I searched

Yellow metal can be effected by gear oil with sulfur.

Yellow metal, brass and bronze.

This is not a myth. Spring steel can also be effected by some greases and oils.

There is usually a reason manufacturers recommend a lubricant.
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Old 11-09-2018, 04:06 PM   #13
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Default Re: Transmission oil,I searched

The EP (Extreme Pressure) additives in some gear oils are activated by heat. It would be interesting to see the test in post #11 repeated, except keeping the gear oil at around 200 Deg F for an extended period of time.
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Old 11-10-2018, 09:07 AM   #14
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Default Re: Transmission oil,I searched

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The EP (Extreme Pressure) additives in some gear oils are activated by heat. It would be interesting to see the test in post #11 repeated, except keeping the gear oil at around 200 Deg F for an extended period of time.
Go for it.
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Old 11-10-2018, 09:14 AM   #15
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Default Re: Transmission oil,I searched

OOOOOOOOOOOOOOOO.....The radiator.
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