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EFV-8 Club Forum / General Ford Discussion / Oils and fluid types used in 1937 Ford Sedan

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Discussion Topic: Oils and fluid types used in 1937 Ford Sedan

gsimpson0701

07-13-2025 @ 5:54 PM

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Posts: 10
Joined: Jun 2025

Iwas wondering if it is necesary to change Transmission fluid and rear axle fluids in my car? If so what type do you recommend?

carcrazy

07-13-2025 @ 8:10 PM

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Posts: 1976
Joined: Oct 2009

It is good to change the oils in the transmission and rear axle every 10,000 miles or so.

For the transmission you can use a GL-4 Gear Oil of SAE 90 weight. If you can't find a GL-4 Gear Oil, you can use NAPA GL-1 Gear Oil SAE 90 weight or Pennzoil Synchromesh Manual Transmission Fluid GL-3.

For the rear axle you should use a GL-5 Extreme Pressure Gear Oil of SAE 90 weight.

Do not use GL-5 oil in the synchromesh transmission as the sulphur in it will attack the copper, brass or bronze parts in the transmission.

same

07-13-2025 @ 8:10 PM

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gsimpson,yes change all fluids especially if you just got the car a dont know the history. in my '37 fordor eng oil -10w40 conventional at oreillys low cost cause its getting drained at or near 1 thousand miles no oil filter.plus 1/2 qt. marvel mystery oil. trans/GL4 gear oil also oreillys 85/140 wt. cause its hot in iowa same goes for differential. Tom.

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