Factory finned rear diff cover - Page 3 - 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 #25 of 54 (permalink) Old 08-22-2019, 11:20 AM
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Originally Posted by 1ton View Post
Don't they make one with a drain plug?
Thankfully, no.

If they had drain plugs people would be tempted to just drain and refill, without looking inside and verify that it all looks good still, and unable to get the last crap at the bottom cleaned out.

If there was a drain plug, it should at least be in the housing, at the lowest point.

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

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post #26 of 54 (permalink) Old 08-22-2019, 12:35 PM
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I determine whether or not I need to investigate anything inside the differential based on the fluid condition drained out. If its contaminated or full of metal and the magnet is full of debris then that would be worth looking...
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post #27 of 54 (permalink) Old 08-22-2019, 12:52 PM
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I determine whether or not I need to investigate anything inside the differential based on the fluid condition drained out. If its contaminated or full of metal and the magnet is full of debris then that would be worth looking...
I've caught ring gears with hairline cracks, shims that had started to migrate out, and other ailments, by looking inside.

Sure, those problems would've eventually made themselves known, but I like catching them before it's too late.

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

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post #28 of 54 (permalink) Old 08-22-2019, 01:48 PM
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For whoever asked... I use a K-TC in a wet well in my aam cover and it runs up to my calibrated Fluke 52 in the center console. It does no good to guess and fool myself so I don't guess at anything. Ive done years of I&C work in fed controlled Pharma and Nuclear plants and I personally like 100% accuracy, anyway.
The finned cover adds no capacity but the cooling is more important. Craig
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post #29 of 54 (permalink) Old 08-22-2019, 02:45 PM
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Found the cover for $150.00 from Find or Sell Auto parts
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post #30 of 54 (permalink) Old 08-22-2019, 03:01 PM
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Originally Posted by BFD View Post
For whoever asked... I use a K-TC in a wet well in my aam cover and it runs up to my calibrated Fluke 52 in the center console. It does no good to guess and fool myself so I don't guess at anything. Ive done years of I&C work in fed controlled Pharma and Nuclear plants and I personally like 100% accuracy, anyway.
The finned cover adds no capacity but the cooling is more important. Craig
I'm the one who asked and its certainly good to know you're not throwing out "facts" without actually knowing... A common problem among forums so weeding through BS can be necessary.

That said, why I even asked how you came to your conclusion is because before I installed my Mag-Hytec cover I installed a temperature sender for an in-cab gauge on my stock cover. I ran it for about a year through all seasons and driving conditions and then installed the Mag-Hytec and re-filled with the same exact fluid so I had something to base an understanding off of.

What I found was the MH cover was more efficient in every way than the stamped steel cover. Fluid temps were overall cooler but slower to warm and quicker to cool off. Well worth the investment.

And just to be clear...this is in no way a pitch or promotion for Mag-Hytec. I could care less what differential cover anyone uses. I just loath liars and people who love branding more than they do the truth. Forums should about usable information, not trying to make everyone think you're cool.
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post #31 of 54 (permalink) Old 08-24-2019, 01:20 PM
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I didn't have any luck with a MH cover. My 97 D80 ran up to 282*, with the same K-TC, and the MH cover only cooled it 3 *. The only thing that worked was to replace all the brgs and I did a meticulous setup. I change lube more often that the book says on all my trucks because of that bad 97 and my D80 and my 03 11.5 AAM both had brg clearance by 80-90k miles. My max tow 12 still has preload and a perfect wear pattern at 120k miles and its the coolest running rear end Ive ever had. From what Ive seen, , cooling is more important than anything else. Craig
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post #32 of 54 (permalink) Old 08-24-2019, 01:43 PM
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Just for sake of information... My differential temps are generally around 175*-185*, driving on the freeway. Speed has a huge determination of running temperature over weight. Meaning, if I'm doing 75 mph for 30 miles or so on a cool day the temps will be in the 150*-160* range. On a warm day I'd expect diff temps to be around 185* or so. Towing heavy in triple digits doing no more than 60 mph the temps might climb to the 190*195* range. Towing up long grades the temp hasnt climbed over 210* and once I crest the grade they quickly drop back to the 195* range.

I've been running 75-140 for the past 5-6 years or so and have been told by a few oil manufactures that I may see a 10* reduction in running temperatures if I used a 75-90. But...I'm not willing to give up the high temp protection during towing for the reduction in thermal buildup from viscosity friction.
And just in case anyone doesnt know... lower range differential ratios will always run hotter due to the increased hypoid action.
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post #33 of 54 (permalink) Old 08-24-2019, 03:36 PM
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^^^^ Amen, Ive also noticed higher temps at high speed, more so than just from weight. I used to see that 280+ with my 97 cuz I was a lot younger and REALLY liked speed! Running FAST on flat road on a hot day raised heat a lot more than pulling the Co. passes. It was those years with that 97 that I worked my way up to RP85w140, to help the heat and wear issues with that D80, cuz that was the only stuff that kept the wear crap off the magnet and I saw NO downside, in as with, cold weather drag or mpg reduction. The RP 85w140 was also the only stuff that didn't require ANY friction modifier for the LSD in the D80. I don't like RP prices but Ive sure had such GREAT results with it. I will probably go down to 75w140 the next time I change cuz of the cooler running finned cover. Craig
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post #34 of 54 (permalink) Old 08-25-2019, 03:48 PM Thread Starter
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Just installed this and factory swaybar and trackbar clear fine on a 2018 2500.
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post #35 of 54 (permalink) Old 08-25-2019, 03:59 PM
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Originally Posted by tsconver View Post
Just installed this and factory swaybar and trackbar clear fine on a 2018 2500.
I think I read here that you will have clearance problems as you add weight or as things articulate.
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post #36 of 54 (permalink) Old 08-25-2019, 04:01 PM Thread Starter
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Originally Posted by Mrhavasu View Post
I think I read here that you will have clearance problems as you add weight or as things articulate.
I have aftermarket airbags so I can prevent sagging. I do not offroad it so articulating is not that large. Got a jeep for that.

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