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03-01-2021, 09:45 PM | #21 |
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Join Date: Dec 2010
Location: Gold Coast , Australia
Posts: 249
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Re: Transmission Oil
Rob, I too use the Penrite 85-140 gear oil.
They are a well respected Aussie company that have for years produce oil specifically for veteran, vintage and classic vehicles. I spoke to their tech guy about this and they claim it is safe for our Ford V8 boxes. I pulled my 38 gearbox apart after 2000 miles, looking for a noise which I have never tracked down. The oil was clean and the bronze bits were unmarked after 2 years using the gear oil. Good enough for me. Dave |
03-02-2021, 04:02 PM | #22 |
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Join Date: Feb 2020
Location: Hayward,CA
Posts: 513
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Re: Transmission Oil
After Jseery’s post that reminds me of the time I drained everything on my Ford Aerostar.
I put gear oil in the five speed transmission. The next day I had a hell of a time shifting it. I looked up the specs and it said to use ATF! I changed it to ATF and it was just fine for the rest of the years I had it. Aerostar five speeds had T5 trannies in them. I always liked the gear ratio spacing in that vehicle. |
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03-02-2021, 07:59 PM | #23 | |
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Location: Perth, Western Australia
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Re: Transmission Oil
Quote:
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04-05-2021, 08:00 AM | #24 |
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Join Date: Mar 2021
Location: Vermont
Posts: 25
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Re: Transmission Oil
I am in the process of purchasing a 1933 pickup. I have an instruction book for 4 cylinder cars and trucks. It says to use SAE250 in the summer for transmission and rear axel. All I can find advertised is synthetic. Any thoughts on this? I would rather ask a stupid question than do something stupid
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04-05-2021, 09:25 AM | #25 |
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Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: Transmission Oil
The call outs for lube was evolving during this time period. If you look at the Ford specs in the late 30 and into the 40s they are recommending want is now GL4. You could also use GL1.
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04-05-2021, 11:21 AM | #26 |
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Location: Glendive MT
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Re: Transmission Oil
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04-05-2021, 11:56 AM | #27 | |
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Location: NM
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Re: Transmission Oil
Quote:
In that same thread, it was stated that the active sulphates in other GL-5's only corrode/discolor brass when oil temps are in the 250°+ range, not something I'd expect in an old Ford.
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04-05-2021, 01:06 PM | #28 | |
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Re: Transmission Oil
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The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
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04-05-2021, 08:42 PM | #29 |
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Location: Sask. Canada
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Re: Transmission Oil
Anybody using #30 motor oil in their standard transmissions? Thats what I have in the four speed T17 in my IH Loadstar. The manual calls for straight mineral oil #50 so this is a little lighter than they recommend. Seems to work great.
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04-06-2021, 08:07 AM | #30 |
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Location: Mount Desert, Maine
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Re: Transmission Oil
Not at all; Lucas is GL 4/5 and very reasonable
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04-06-2021, 12:49 PM | #31 |
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Re: Transmission Oil
Here is the comparison between the different viscosity ratings. But keep in mind that the additives are very different between them.
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04-06-2021, 01:23 PM | #32 |
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Location: Sask. Canada
Posts: 2,419
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Re: Transmission Oil
So according to the chart my #30 motor oil is close in viscosity to an #85 gear oil.
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04-06-2021, 03:20 PM | #33 |
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Re: Transmission Oil
Yep, but again different additives.
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