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EFV-8 Club Forum / General Ford Discussion / 1934 Ford pickup Gear Oil

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Discussion Topic: 1934 Ford pickup Gear Oil

StudeGary

11-02-2025 @ 4:36 AM

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I'm working on a '34 Ford Pickup in the Stillaquamish Valley Pioneer Museum in Arlington, WA. This truck originally belonged to Arlington Hardware. We found many maintenance issues needing to be addressed. I'm ready to refill the transmission and rear end with gear oil. I have some 85/140 GL-5 gear oil. Is that satisfactory for this pickup or is there another oil grade that should be used?

51504bat

11-02-2025 @ 6:14 AM

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I believe you want Gl-4 for the trans but not positive. I know that is what I use for the trans in my '39 p/u.

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nelsb01

11-02-2025 @ 6:45 AM

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If you have a Tractor Supply store near you, they still carry GL-1 for Ford Tractors 1939-1953
It under the Traveler name brand.
Since your transmission has brass parts, you do not want any oil with a GL rating above 4.

This message was edited by nelsb01 on 11-2-25 @ 6:47 AM

StudeGary

11-02-2025 @ 7:13 AM

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I do have a Tractor Supply nearby. I'll look for the GL-1 there for the transmission. Would the GL-5 I already have be OK in the rear differential?

carcrazy

11-02-2025 @ 7:29 AM

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You can also buy GL-1 Gear Oil at your local NAPA Auto Parts Store or from Fifth Avenue Antique Auto Parts. If you get it from Fifth Ave., it comes in a 1 gallon container under #09415GL-1. Their phone is 785-632-3450.

Kens 36

11-02-2025 @ 7:52 AM

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The GL-5 should be fine for your differential. I buy Sta-Lube GL-4 from my local Napa, but you can also buy it on Amazon.

Ken

same

11-02-2025 @ 8:19 AM

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I get GL-4 85-140 at oreilys auto parts. good for trans and diff. Tom.

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