| fortyford | -- 12-14-2023 @ 1:49 PM |
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What is the best gear oil for transmissions and rear ends in early fords these days?Where do you purchase this?GL-4 gear oil seems to be hard to find anymore!
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| carcrazy | -- 12-14-2023 @ 3:00 PM |
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What year Early Ford car do you have? If your car is a late Flathead model (1949-1953) with a Borg-Warner Overdrive, you will want to use a GL-1 Gear Oil in the transmission and O/D unit mounted to the rear of the transmission. An appropriate oil is NAPA SAE 90W API GL-1 Mineral Gear Oil. Your local NAPA store can order it for you and have it in a day or two. The part number for a 1-gallon container is 65-201. If your car has a conventional transmission, you can use Pennzoil Synchromesh Manual Transmission Fluid. This oil provides API GL-3 level performance. Your Rear Axle should be O.K. with an Extreme Pressure Gear Oil API GL-5 hypoid oil like that used in modern rear axles. An SAE 80-90 or straight SAE 90 weight would be acceptable.
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| fortyford | -- 12-14-2023 @ 5:31 PM |
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I have a stock 1940 ford with no over drive and also a stock 1952 Ford F-1.There is so many different gear oils out there now.If you notice now most of these are synthetic oils?Seems to me like the market for say just GL-4 gear oil has got complicated.
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| Carcheologist | -- 12-14-2023 @ 7:17 PM |
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O'Reilly auto parts has GL4 gear lube.
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| fortyford | -- 12-15-2023 @ 5:25 AM |
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Yes they do but it says SAE 140,what does that mean?I would rather have 90W.I located some at a NAPA near me,well they had to order it?I am not interested in using GL-5 in my old Fords! https://www.napaonline.com/en/p/SL_SL24239 This message was edited by fortyford on 12-15-23 @ 5:46 AM
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| Carcheologist | -- 12-15-2023 @ 7:45 AM |
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140 wt. is just fine for your '40 Ford. That's what I use in my '40 with absolutely no problems.
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| fortyford | -- 12-15-2023 @ 2:54 PM |
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Do you not have any shift problems when it is cold weather?
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| Carcheologist | -- 12-15-2023 @ 7:15 PM |
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No sir, don't have any shifting problems in our cold weather here in Texas. The 140 wt. GL4 gear oil actually makes shifting easier in all temperature ranges.
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