| Classic1 | -- 08-04-2014 @ 11:30 AM |
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I need to change the transmission fluid in my '39 Deluxe, 3 speed gearbox. Searching the archives, I've seen recommendations for: 95W/140 75W/140 80W /90 Now I'm feeling particularly confused. The car is located in Chicago and will see summer spring and fall driving temperatures. No winter driving or temps below freezing. Also wondering if there is a particular brand that stands out as the best choice? Any suggestions would be greatly appreciated. Thanks! Steve '39 DeLuxe Fordor
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| Drbrown | -- 08-04-2014 @ 7:56 PM |
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Ford recommends SAE 140W Gear Oil. Recommend 75-140, 85-140 or 95-140 pending availability. Straight 140 if available may result in harder shifting. Avoid GL4 and especially GL5 as they have additives. Same for Columbia and BW overdrives.
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| Classic1 | -- 08-06-2014 @ 7:04 PM |
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I'm curious about your reference to 140 creating harder shifting. Harder in terms of moving the stick or do you mean something else? Sorry, just trying to understand this. Thanks! Steve '39 DeLuxe Fordor This message was edited by Classic1 on 8-6-14 @ 7:05 PM
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| David J | -- 08-07-2014 @ 3:18 AM |
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This subject is a can of worms BUT!! I live in WI and drive mine like you . Ford Calls for SAE140 above freezing and it seems to me they have it right . The hard shift bit is from the THICK fluid in below freezing temps . Fine when warmed up though .I don't buy into the GL5-GL4-GL1 story as it doesn't hurt my JD's nor my cars . Use GL4 if you are worried about it . REMEMBER GL1 is nothing but mineral oil - no EP additives . Maybe fine for a model A but not these . PS I use straight SAE 140 in steering box , tranny , u-joint and rear with no complaints . Your call of course .
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| 40 Coupe | -- 08-07-2014 @ 3:45 AM |
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I agree with David J, I use NAPA Sta-Lube P/N SL24238 for the 1 Gal size. it is 140 with API/GL-4
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| rotorwrench | -- 08-07-2014 @ 3:54 PM |
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GL4 is the replacement for the now completely obsolete GL3 gear lube. It is as close to the recommended mild EP that is available for the Borg Warner electric overdrive transmissions. The GL5 stuff has high EP for Hypoid gears and the higher sulphur content is what does the damage to yellow metals or make sprag clutches slip. GL1 has no EP additives and is safe as it gets for old antique gearboxes with a lot of brass & phosphor-bronze in them or old worm screw drive rear axles. Any oil is better than no oil at all. I still have some old Texaco Thuban SAE 140 but when it's gone I will probably look for the Lubriplate SPO-277 lube. The Sta-Lube GL4 is what I use in the 51 Mercury overdrive gearbox. This message was edited by rotorwrench on 8-7-14 @ 4:01 PM
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