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10-16-2020, 09:34 PM | #1 |
Junior Member
Join Date: Jun 2017
Location: Oshkosh, Wi
Posts: 9
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Toploader installation.
I’m installing a truck based toploader in a 39 sedan. What trans fluid are you all using in the top loader?
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10-16-2020, 10:41 PM | #2 |
Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,527
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Re: Toploader installation.
From what I have read, 80W-90 GL4 is recommended.
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10-17-2020, 08:11 AM | #3 |
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Join Date: May 2010
Location: upstate SC
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Re: Toploader installation.
GL 1 available from tractor supply for use in Ford tractors--straight mineral oil, GL 3/4/5 from experience will melt away your syncro's
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10-17-2020, 09:44 AM | #4 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,436
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Re: Toploader installation.
GL3 rating was updated to GL4 rating many years ago. It is still a mild EP and mild EP lube was recommended by Ford for the overdrive transmissions of the late 40s & 50s. While synchro blocker rings are yellow metal, they aren't as soft as the phosphor bronze bushings used in the early transmissions. Most of the worry was about the bushings and thrust washer in there. Mild EP is fine but no-EP lubes like GL1 will work OK if the vehicle is driven lightly like most antique vehicles are.
I still use Aeroshell W100 motor oil with no plus designation for my old transmissions. It is expensive but it's good stuff. It's an SAE 50 motor oil that has the same viscosity as straight SAE 90 gear lube. A person can use GL5 in the rear axle since there are no bushings in there. |
10-17-2020, 10:48 AM | #5 |
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Join Date: Nov 2012
Location: Wichita KS
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Re: Toploader installation.
Alan, that goes against Ford's recommendations, they recommended mild EP gear lubricant for transmissions. That would be GL4 in todays world.
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10-17-2020, 11:49 AM | #6 |
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Location: upstate SC
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Re: Toploader installation.
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10-17-2020, 12:00 PM | #7 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: Toploader installation.
Ford lubrication chart. GL5 will damage "yellow" metal in transmissions, but GL4 is what is called out for these trans.
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10-17-2020, 02:06 PM | #8 |
Junior Member
Join Date: Jun 2017
Location: Oshkosh, Wi
Posts: 9
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Re: Toploader installation.
Thanks guys. Good advice.
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10-18-2020, 03:56 AM | #9 |
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Join Date: May 2010
Location: FP, NJ
Posts: 2,770
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Re: Toploader installation.
The one thing I was looking for in the chart is capacity of the differential. It's not listed. Does anyone know what it is? Thanks!
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10-18-2020, 11:31 AM | #10 |
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Join Date: Oct 2016
Location: harpursville ny
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Re: Toploader installation.
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10-18-2020, 01:03 PM | #11 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,436
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Re: Toploader installation.
One thing I forgot to ask yesterday is what truck is this transmission from? It could be a T170 RTS for all we know. I can't see using a truck transmission in a car unless there is some advantage.
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10-18-2020, 06:53 PM | #12 |
Junior Member
Join Date: Jun 2017
Location: Oshkosh, Wi
Posts: 9
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Re: Toploader installation.
Early 50’s I think. It’s a conversion to allow the top loader with a closed drive shaft. Good for after the body is finished. No need for major work underneath.
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