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Recommended oil weight for rear differential

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Old 09-16-2013, 06:48 PM   #42
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I have an 08 reg cab base and I changed mine with mobil 1 75w 90. Took 4 full quarts until full. Anybody know what the specs call for as far as quantity or past experience?
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Old 09-16-2013, 07:10 PM   #44
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Quote:
Originally Posted by TacoMan1911 View Post
I have an 08 reg cab base and I changed mine with mobil 1 75w 90. Took 4 full quarts until full. Anybody know what the specs call for as far as quantity or past experience?
Idk what the specs are but im for certain it isnt 4qts. Was the truck anywhere near level when you pumped it in.


Edit: seems as though that is about correct, 3.4qts. By the time you leave a little in each court you would be right on.
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Old 09-16-2013, 07:13 PM   #45
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Originally Posted by TACO TX View Post
Idk what the specs are but im for certain it isnt 4qts. Was the truck anywhere near level when you pumped it in.
It is a second gen., and the truck was perfectly level in my garage. The book says 3.5, but at that much the diff was no where full. At exactly 4, the oil started to slowly come out of the fill hole. How much does your truck take?
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Old 09-16-2013, 07:22 PM   #46
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Quote:
Originally Posted by TacoMan1911 View Post
It is a second gen., and the truck was perfectly level in my garage. The book says 3.5, but at that much the diff was no where full. At exactly 4, the oil started to slowly come out of the fill hole. How much does your truck take?
Yea i know, i corrected. If your pumping it in you leave quite a bit in each qt which i add to the next qt and then at the end i have what should be in your case .5qt left over. Mine has the locker and only takes like 2.5qt.
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Old 09-17-2013, 07:37 AM   #47
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Not sure about a Gen 2 Taco, but my non-LSD 3.90 geared Gen 1 rear end held right around 3.75 qts. Of course, I pumped it from a gallon container and there was some left in the pump. Fiddling with all those quart containers doesn't work well with transmissions/transfer cases so I only buy gear oil in gallon jugs now.
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Old 09-18-2013, 03:06 PM   #48
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Typically old-school, you can fill the case until it starts to run out the fill hole... Works on boat lower units all day long... Not sure if over-filling will cause any damage on the truck though...
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Old 09-18-2013, 05:13 PM   #49
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Quote:
Originally Posted by Backinblack03 View Post
Typically old-school, you can fill the case until it starts to run out the fill hole... Works on boat lower units all day long... Not sure if over-filling will cause any damage on the truck though...
Thats how i do it, i just keep a talley to see how close i actially got to the number. If your truck was really unlevel and you crammed a bunch in there you would problay blow the axle seals out is all if it didnt burp through the breather.
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