Rear Differential Fluid Drain...Need Help - Page 4 - Dodge Cummins Diesel Forum
2013-2018 General Discussion General Chit Chat About the 2013 model year differences 6.7L 4th generation Cummins - NO ADVERTISING - Sponsored by: StarLite Diesel

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post #37 of 66 (permalink) Old 03-01-2019, 08:20 PM
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Here's a good alternative, even my dealer doesn't pull the cover.
I'd consider that the worst alternative. Okay, better than never changing the fluid.
At least with a drain plug most of the contaminants will come out.


Maybe if we start telling people that the brain is an app, they will start using it?

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post #38 of 66 (permalink) Old 03-01-2019, 08:20 PM
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I usually use the overkill method, taking the slowest speeds, longest allowable distances, etc. from three or four gear manufacturers.

In other words, if one source says no more than 50 mph and another 60, I go with 50.



And absolutely no towing until after at least 500 miles. Then ideally the correct procedure for that part of the break-in.



Normally I also change the fluid between 500 and 1,000 miles the first time.


I just posted the question of break in as a separate post. I知 over 500 miles and I知 going to tow around 7K 1500 miles. Then I was thinking to change the rear diff. I did similar on my duramax. Perhaps I should change it after getting to OK (750 miles towing the 7K); that would be around 1300 miles on the ODO. Then tow back to IA on fresh fluid.



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post #39 of 66 (permalink) Old 03-01-2019, 08:23 PM
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I just posted the question of break in as a separate post. I知 over 500 miles and I知 going to tow around 7K 1500 miles. Then I was thinking to change the rear diff. I did similar on my duramax. Perhaps I should change it after getting to OK (750 miles towing the 7K); that would be around 1300 miles on the ODO. Then tow back to IA on fresh fluid.
I would change the fluid before the trip, then take a look at what's on the magnet when back home again.
At the very least I think you should check the magnet before leaving.

Maybe if we start telling people that the brain is an app, they will start using it?

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post #40 of 66 (permalink) Old 03-01-2019, 08:26 PM
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I would change the fluid before the trip, then take a look at what's on the magnet when back home again.

At the very least I think you should check the magnet before leaving.


Change it with only 600 miles before towing? Then again after the 1500 miles towing the 7K?


The thought being to get fresh fluid in to flush out the break in contaminants before putting the weight behind her?




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post #41 of 66 (permalink) Old 03-01-2019, 08:30 PM
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Change it with only 600 miles before towing? Then again after the 1500 miles towing the 7K?
Sorry, that's not what I meant. I'd change it at 600 miles, yes, but then leave well enough alone for 10,000 to 15,000 miles, depending on usage.

Oh, and take a peek at the magnet ever so often in between.

Maybe if we start telling people that the brain is an app, they will start using it?

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post #42 of 66 (permalink) Old 03-01-2019, 08:36 PM
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I'd consider that the worst alternative. Okay, better than never changing the fluid.
At least with a drain plug most of the contaminants will come out.
I mean a better alternative than loosening the cover bolts and letting it drain as the OP was asking about. As you mentioned, who know what trash would get between the gasket and sealing surface.

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post #43 of 66 (permalink) Old 03-01-2019, 08:37 PM
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Sorry, that's not what I meant. I'd change it at 600 miles, yes, but then leave well enough alone for 10,000 to 15,000 miles, depending on usage.



Oh, and take a peek at the magnet ever so often in between.


So I値l change it before my trip. Then again prior to 渡ormal after doing some towing. As I think under severe duty amsoil says 50K with their severe gear 75W90. Not sure I知 comfortable if a lot of they was towing...to go 50K!




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post #44 of 66 (permalink) Old 03-01-2019, 08:57 PM
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So I値l change it before my trip. Then again prior to 渡ormal after doing some towing. As I think under severe duty amsoil says 50K with their severe gear 75W90. Not sure I知 comfortable if a lot of they was towing...to go 50K!
I wouldn't change it twice in relatively rapid succession, unless you find crap in there on the first change.
Not knowing what or how often you tow, it's hard for me to guess how often the diff may need attention. The magnet will tell part of the story.

I nearly always tow, it's only a matter of what, and use Amsoil 75W-140. But I wouldn't feel comfortable going 50K without seeing what's going on in there, even if I didn't tow.
And once the cover is off, I certainly wouldn't put the old fluid back in.

Maybe if we start telling people that the brain is an app, they will start using it?

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post #45 of 66 (permalink) Old 03-01-2019, 09:10 PM
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I wouldn't change it twice in relatively rapid succession, unless you find crap in there on the first change.

Not knowing what or how often you tow, it's hard for me to guess how often the diff may need attention. The magnet will tell part of the story.



I nearly always tow, it's only a matter of what, and use Amsoil 75W-140. But I wouldn't feel comfortable going 50K without seeing what's going on in there, even if I didn't tow.

And once the cover is off, I certainly wouldn't put the old fluid back in.


agreed. No way I would put the fluid I just drained back in. 75W140. Copy. Maybe I was confusing the Ram with my duramax. I thought amsoil and even ram recommended 75W90....??? Do they have 75/140 in it from factory? Or do most run 140 no matter what Ram...or amsoil day?


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post #46 of 66 (permalink) Old 03-01-2019, 09:15 PM
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No, the 140 isn't recommended. But since it's still a 75W when cold, it shouldn't hurt anything. If it helps when towing heavy, great.
Besides, many run the 140 in Rams.

Maybe if we start telling people that the brain is an app, they will start using it?

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post #47 of 66 (permalink) Old 03-01-2019, 10:47 PM
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No, the 140 isn't recommended. But since it's still a 75W when cold, it shouldn't hurt anything. If it helps when towing heavy, great.

Besides, many run the 140 in Rams.


Safe to assume this applies to rear diff only (changing fluid at 500-1000 miles) I致e never followed this procedure for the front diffs...double checking I知 not wrong with that technique!



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post #48 of 66 (permalink) Old 03-02-2019, 02:12 AM
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Heck, it's a lot quicker and easier to pull and reinstall a diff cover than it is to change a flat tire.
Why learn to change a tire....when there痴 this

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