Factory finned rear diff cover - Dodge Cummins Diesel Forum
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post #1 of 54 (permalink) Old 08-21-2019, 08:47 AM Thread Starter
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Factory finned rear diff cover

Will the factory finned aluminum cover fit the rear diff on a 2018 Ram 2500?


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post #2 of 54 (permalink) Old 08-21-2019, 08:55 AM
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When did Ram make a finned cover?

2018 3500 Cab and Chassis CM Bed
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post #3 of 54 (permalink) Old 08-21-2019, 09:02 AM Thread Starter
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AAM 74030017 is the part number from aam it comes on the 3500 max tow.
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post #4 of 54 (permalink) Old 08-21-2019, 09:57 AM
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I put one on my 2012 2500 so unless thy have changed the axle, it should fit.

1998 12v, 4x4, Club Cab, Carli, Thuren, BlueTop, Core 4x4, BD Diesel, PDD 5x.012, South Bend
2012 Laramie Longhorn, EFI by Ryan, Carli, Thuren
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post #5 of 54 (permalink) Old 08-21-2019, 09:57 AM
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Yes it will fit. You will have to put a spacer on the Sway bar mounts. Some have ground the lower finn's for clearance also. Dodge Offroad sells Spacers that are 1.75" that some have used. Others used 1/2" shims.

2018 Ram Big Horn. Crew Cab Short Box. 6.7Ltr. 68 RFE. Thuren Suspension
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post #6 of 54 (permalink) Old 08-21-2019, 10:06 AM Thread Starter
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Originally Posted by G. Mcpherson View Post
Yes it will fit. You will have to put a spacer on the Sway bar mounts. Some have ground the lower finn's for clearance also. Dodge Offroad sells Spacers that are 1.75" that some have used. Others used 1/2" shims.
That is what I needed was not sure if the sway bar would clear.

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post #7 of 54 (permalink) Old 08-21-2019, 10:15 AM Thread Starter
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Just ordered one, found them in stock for $185.

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post #8 of 54 (permalink) Old 08-21-2019, 11:05 AM
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Just ordered one, found them in stock for $185.
where?
do they add fluid capacity?

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post #9 of 54 (permalink) Old 08-21-2019, 11:10 AM Thread Starter
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Originally Posted by kylant View Post
Quote:
Originally Posted by tsconver View Post
Just ordered one, found them in stock for $185.
where?
do they add fluid capacity?
I don't think they add any capacity just cooling.

C&M Gearworks had them in stock.

$185 seems to be a good price.
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post #10 of 54 (permalink) Old 08-21-2019, 03:31 PM
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I have the finned cover on my 3500 max tow and that cover really cool's great. I've had an aftermarket mag cover that doubled the capacity but it didn't cool worth a darn and the extra capacity didn't do any good except allow longer change intervals. I thought the aam cover was more like $130 but it still well worth 185 for the cooling it does. The aam. cover also has grooves cast on the inside to direct oil out to the carrier bearings. My truck has 120,000 miles and it has always been used for towing by the previous owner and myself and the bearings are in the best shape that I've seen in any of my trucks... I check my diff with a dial indicator every blue change. Craig
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post #11 of 54 (permalink) Old 08-21-2019, 03:40 PM
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2500 = 11.5
3500 with aisin = 11.8
2019 3500 = 12 inch

Not sure if the covers interchange.

Not sure on the 3500 if it's just Aisin or Aisin DRW combination.

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post #12 of 54 (permalink) Old 08-21-2019, 03:40 PM
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Quote:
Originally Posted by BFD View Post
I have the finned cover on my 3500 max tow and that cover really cool's great. I've had an aftermarket mag cover that doubled the capacity but it didn't cool worth a darn and the extra capacity didn't do any good except allow longer change intervals. I thought the aam cover was more like $130 but it still well worth 185 for the cooling it does. The aam. cover also has grooves cast on the inside to direct oil out to the carrier bearings. My truck has 120,000 miles and it has always been used for towing by the previous owner and myself and the bearings are in the best shape that I've seen in any of my trucks... I check my diff with a dial indicator every blue change. Craig
About 4 or 5 years ago, you could find them online for less than $100 easily......then one day they just doubled....

FCA at it's best....

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