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85w 140 Vs 80 90w

 
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Old 02-20-2008, 06:52 PM
78fordranger
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85w 140 Vs 80 90w

will it hurt to run this heavier gear oil 85-140 in the truck? I wasnt paying attention when I grabbed it just seen the GL-5. So can I run this in my tranny or rear ends? Or do I need to take it back and exchange it for the lighter stuff? I plan on adding a quart of lucas oil to everything. I got about 2 quarts or 80 90 so if the heavier stuff is okay in the diffs and transfer case then I will use it there and use more lucas if it needs it in my tranny.
 
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Old 02-21-2008, 09:51 AM
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Ford's specified manual transmission lubricant is 50W engine oil in normal temps and 30W in extremely low winter temps. 85-140 is WAY too thick. Take it back and get 80W-90 for the axles. 20W-50 engine oil works well in the transmissions, especially if you live in a cold climate.
 
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Old 02-21-2008, 12:06 PM
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Originally Posted by n9lhm
Ford's specified manual transmission lubricant is 50W engine oil in normal temps and 30W in extremely low winter temps.
I hope my '79 Ford Truck Shop Manual - Maintenance & Lubrication doesn't have a misprint.

For a 3 speed manual, a 4 speed manual, or a 4 speed Overdrive manual transmission it specifies (Ford spec ESP-M2C83-C) "Standard Transmission Lube", which IIRC, is a GL-4 rated lube. (Not the (Ford spec ESW-M2C105-A) "Hypoid Gear Lubricant" specified for the differentials, and not (Ford spec ESE-M2C144-A) engine oil).

Ford does spec the SAE 30 and SAE 50 (ESE-M2C144-A) engine oil in the main and auxilliary transmissions in their Heavy Duty (600 through 9000 Series) Trucks.
 
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Old 02-21-2008, 12:19 PM
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I've ran 80w-90 and up to 140w in Ford diffs, transmissions and transfer cases for many years without problems, down to -25* F. If you have hard shifting when cold, you might switch to 50w trans oil.

Jason
 
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Old 02-21-2008, 02:45 PM
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Ford spec ESP-M2C83-C "Standard Transmission Lube" is what they went to in the late '70s instead of engine oil IIRC. I mistakenly put 80-90 in my NP-435 when I first got it (changed all the fluids in the truck) and the synchronizers wouldn't work worth a hoot when it was cold, even in spring and fall, and the truck only had 30,000 miles on it. As soon as I replaced it with 20W-50 all was fine.
 
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Old 02-21-2008, 06:32 PM
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so use 80 90 in the diffs and transfer case and 20-50 motor oil? in the tranny? I live in north central washington so its 0 in the winter and 100 in the summer
 
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Old 02-21-2008, 07:06 PM
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I run 85/140 in the Dana 60 rear of my Supercab. I tow and carry heavy stuff so I like the thicker stuff. Probably giving up a little mileage but it's a 460. I'd never know the difference.
 
 
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