| SloPokPete | -- 03-03-2024 @ 11:53 AM |
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I recently was part of a discussion regarding the proper weight oil for the transmission and differential on pre 40 Fords. As usual there were several different opinions. So what is the correct or recommended oil weight for the transmission and differential? It was regarding a 1939 Ford that started the discussion. I felt this would be the place to get the correct answer. Thanks Jeff
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| carcrazy | -- 03-03-2024 @ 2:17 PM |
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According to the 1939 Passenger and Commercial Reference Book (aka the Owner's Manual): The oil to use in the transmission is Transmission Lubricant Gear Oil - Winter S.A.E. Viscosity 90, Summer S.A.E. Viscosity 140 The oil to use in the rear axle is Mild Extreme Pressure Gear Oil - Winter S.A.E. Viscosity 90, Summer S.A.E. Viscosity 140 The oils I use year round are: for the transmission NAPA S.A.E 90W API GL-1 Mineral Gear Oil and for the rear axle either Pennzoil SAE 80W-90 Gear Lubricant GL-5 or Valvoline Gear Oil SAE 80W-90 Gear Lubricant GL-5.
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| SloPokPete | -- 03-04-2024 @ 10:36 AM |
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Thanks for information! Jeff
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| 1934 Ford | -- 03-05-2024 @ 6:15 PM |
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I agree with Car Crazy. Don't forget the steering box. (I use John Deere Corn Head Grease. It's a grease that has a very high melting point) The V8's steering box is right next to the exhaust manifold and gets so thin it leaks out. The John Deere Corn Head Grease solves that problem. Available a good John Deere Dealers, and I put it in with a putty knife. 1934 Ford's since 1972
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