Diff and T/C grear oil - frequency - Defender Source
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  #1  
Old November 2nd, 2015, 12:26 AM
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Use Redline 75w-90 like many here. Changed the front diff at 7.5k and rear (w/ truetrac) at 5k. Oil looked fine but used. About to change the t/c oil at 7.5k but it still looked new. Like zero miles new. Is that normal?
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  #2  
Old November 2nd, 2015, 01:12 AM
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Gear oil should come out clean unless there has been water contamination between intervals. Engine oil on the other hand is exposed tougher operating condition with direct exposure to ignition, pressure, heat.... why look so much dirtier.
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Old November 2nd, 2015, 01:31 AM
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Factory service interval is 30k with regular Dino. If you don't get water in it, synthetic gear oil will last pretty much indefinitely. 30k service is more than sufficient but check it every oil change and top up as needed.
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Old November 2nd, 2015, 06:57 AM
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I just changed my diff oil this weekend and they were both had water contamination. I do not know how old the old was. What's the main source for water ingress into the diffs?
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Old November 2nd, 2015, 08:50 AM
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Question

Why change at 7.5k?
Spiral bevel gears in the diffs may wear differently than helical gears in the TC.
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  #6  
Old November 2nd, 2015, 08:57 AM
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Yes, 30k is way more than enough. If you are wading, then you should be checking it after a run to make sure it is not contaminated.
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  #7  
Old November 2nd, 2015, 09:22 AM
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Quote:
Originally Posted by Red90 View Post
Yes, 30k is way more than enough. If you are wading, then you should be checking it after a run to make sure it is not contaminated.
That's why I buy the Dino stuff in a 5 gallon pail and use a lever pump. Synthetic isn't worth the investment if your truck sees water.
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Old November 2nd, 2015, 09:31 AM
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Originally Posted by Kevin88RRC View Post
I just changed my diff oil this weekend and they were both had water contamination. I do not know how old the old was. What's the main source for water ingress into the diffs?
Is your breather tube connected right? If any of the seals that keeps oil in the axle is leaking, you can assume water can get in.

This is part of the reason why I'd rather change out cheap oil often than keep expensive oil for long.
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  #9  
Old November 2nd, 2015, 09:40 AM
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Quote:
Originally Posted by Grover View Post
Why change at 7.5k?
Spiral bevel gears in the diffs may wear differently than helical gears in the TC.
Needed to change the engine oil & filter (3k, looked great, no particulates, lightweight filter). Given the coveralls were on, 3-yr old is napping, admiral's green light received, best to take advantage of this diminishing opportunity. Justin mentioned changing the diff oil after a few thousand on the new truetrac install. Then once the suction pump is out and filled with gear oil..... you get the idea.
I'll check the diff breather lines for a leak. Perhaps the truetrac had some moly grease in there.
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  #10  
Old November 2nd, 2015, 10:30 AM
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My diff fluids have never come our looking new (golden). Always gray and smelly, even once when I swapped out a diff after a couple months during a trouble shooting wild goose chase.
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  #11  
Old November 2nd, 2015, 11:55 AM
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Originally Posted by Kevin88RRC View Post
What's the main source for water ingress into the diffs?
Old, leaky seals... then wading when the axle is hot will suck water into the axle.


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Old November 2nd, 2015, 12:14 PM
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Originally Posted by Nomar View Post
Old, leaky seals... then wading when the axle is hot will suck water into the axle. .
I've read somewhere that people have used an air compressor to pressurize the diffs to alleviate that. I'd like to do that.
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  #13  
Old November 2nd, 2015, 12:44 PM
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If you oil gets contaminated off road.....you should then fix the leaking seals.....and make sure the breather is clear and has been located to a safe and high location. you really do not want to toast all of your bearings while in the bush.

I do agree, there is no justification for using synthetic in the axles. I've never seen any of these axle components wear unless the oil got contaminated. Regular gear oil will protect them forever. Synthetic will just be foreverer.
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Old November 2nd, 2015, 12:44 PM
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Quote:
Originally Posted by Nomar View Post
Old, leaky seals... then wading when the axle is hot will suck water into the axle.
Only if the breather is not clear.
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  #15  
Old November 2nd, 2015, 12:52 PM
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Quote:
Originally Posted by down_shift View Post
Needed to change the engine oil & filter (3k, looked great, no particulates, lightweight filter). Given the coveralls were on, 3-yr old is napping, admiral's green light received, best to take advantage of this diminishing opportunity. Justin mentioned changing the diff oil after a few thousand on the new truetrac install. Then once the suction pump is out and filled with gear oil..... you get the idea.
I'll check the diff breather lines for a leak. Perhaps the truetrac had some moly grease in there.
Yup, with a toddler of my own, I know where you are coming from...
I'm about to change the diffs and TC with RL75w90...

Cheers...
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  #16  
Old November 2nd, 2015, 01:48 PM
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Yes.
Make sure the axle vent/breather is clear.

I've got an article(somewhere) about some of the RRC's in Australia that run slightly pressurized air in the axles to keep air out.

Seems like a lot more work...


.
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  #17  
Old November 2nd, 2015, 04:42 PM
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Yes.
Make sure the axle vent/breather is clear.

I've got an article(somewhere) about some of the RRC's in Australia that run slightly pressurized air in the axles to keep air out.

Seems like a lot more work...


.
I would just avoid the puddles...
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  #18  
Old November 2nd, 2015, 09:14 PM
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Just make sure seals are good and have the breather tube located high up. Whole point of the breather tube is so that pressure is equalized in the axle to the atmosphere with change in temperature so you don't blow the seals.

Forget this pressurizing the diff case... That sounds like a surest way to blow seals and cause leak. Leak can go both ways, in and out.
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  #19  
Old November 2nd, 2015, 09:56 PM
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I would just avoid the puddles...
It is not a day off road unless you have water over the hood.
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