Gear Oil

"functionoverfashion" (functionoverfashion) 05/16/2019 at 10:10 • Filed to: None

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Actual picture of the sludge that came out of my truck:

I’ve been on a mission to change all the fluids on my truck, having never done it before, and having no idea of the age of some (any) of them besides the engine oil and coolant. As a refresher, this truck has, of course, a front and rear diff, transmission, transfer case, and two steering knuckles, all of which have fluids that could very well pre-date the Nixon administration. So I spent the last couple nights crawling around under the truck draining and replacing, and I have exactly zero pictures because I could not possibly handle my phone with the condition of my hands while doing this.

I will take a picture - or better yet, make a GIF, of the supposedly 140W gear oil that came out of the steering knuckle. It was quite literally the consistency and color of molasses in January; maybe even closer to a smooth peanut butter. I drained it into a 1-qt plastic yogurt container (it only filled it about 20%) and I swear I could leave it upside-down for 5-10 seconds without spilling any. Alarmingly, one side did not drain ANY fluid out. I did notice that side looked drier than the other, which was one reason for doing this in the first place. I’ll make a note to top that off again.

The transmission had a fair bit of shine to it from bits of metal shavings, though nothing big. Probably way overdue for a change on that one.

I’ve also learned the value of those 5-gallon pails with a long-handled pump on the top, for moving large volumes of even 90W gear oil. I borrowed one for the 140W gear oil from a friend, because his bucket was low and he wanted an excuse to buy a new full one. But I don’t have one for the 90W, and I’ve now been through a gallon using a tiny hand pump on a quart bottle. It’s been a real treat. I’ve got probably another gallon to go between the transmission (halfway done when I ran out) and the transfer case. At least the transfer case is super easy to reach! In hindsight, maybe I should have emptied the 140W, then put 2 gallons of 90W in that bucket so I could use the sweet pump.

Thankfully, this isn’t something I’ll do every year. It’s been good to spend time getting to know all the working parts of the truck, though, and bringing all the basic maintenance items up to date. Maybe next year I’ll start chasing some oil leaks. The oil pan gasket, for example, looks to be doing very little to contain oil. On the other hand, automatic perpetual oil undercoating!

Party-vi > functionoverfashion 05/16/2019 at 10:46

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that looks like it would be tasty on a hot dog with some onions and cheese

Kiltedpadre > functionoverfashion 05/16/2019 at 10:50

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Don’t lie to us; that is obviously a pot of chili.

jimz > functionoverfashion 05/16/2019 at 12:04

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I will take a picture - or better yet, make a GIF, of the supposedly 140W gear oil that came out of the steering knuckle. It was quite literall y the consistency and color of molasses in January; maybe even closer to a smooth peanut butter.

I can’t begin to imagine the smell.

DipodomysDeserti > Party-vi 05/16/2019 at 12:15

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Or on top of enchiladas

RacinBob > functionoverfashion 05/16/2019 at 13:41

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What make, year and how many miles on the truck?

functionoverfashion > RacinBob 05/16/2019 at 15:01

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1961 Ford F100, about 40,000 miles. 

razorbeamteam > functionoverfashion 05/16/2019 at 17:21

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Replacing fluids is so satisfying. I just did the oil on my rear axle because the hub seal failed.

RacinBob > functionoverfashion 05/16/2019 at 18:52

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Oh, that was factory lube in the 60's....

It is interesting I suppose that water condenses in and never leaves. 

functionoverfashion > razorbeamteam 05/20/2019 at 09:06

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It is, although I found out I was supposed to put 50W in the transfer case. I put in 90W. Not a big deal in the summer, but I’ll still need to change it out. At least the 50W will be easier to get in there than the 90W with the little hand pump.