Rear diff oil? - Page 2 - 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 #13 of 32 (permalink) Old 08-23-2019, 06:10 PM
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I'm confused... I thought the 4th gen trucks have torsion differentials. Friction modifier does nothing for those.

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post #14 of 32 (permalink) Old 08-23-2019, 06:16 PM
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I'm confused... I thought the 4th gen trucks have torsion differentials. Friction modifier does nothing for those.
It's technically not REQUIRED, however some people are getting some chatter, especially warmed up, and it seems to help.

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post #15 of 32 (permalink) Old 08-23-2019, 06:19 PM
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It's technically not REQUIRED, however some people are getting some chatter, especially warmed up, and it seems to help.
How can it help? There's nothing but gears in there. No clutches for the friction modifier...

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post #16 of 32 (permalink) Old 08-23-2019, 06:19 PM Thread Starter
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When backing up while turning or taking off with the wheels turning. Does it for a second or two then stops.
Yes, exactly that.

Add the tube/bottle of limited slip additive to the gear lube and that will go away.
Is there a certain brand/type I need to use?

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post #17 of 32 (permalink) Old 08-23-2019, 06:23 PM
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How can it help? There's nothing but gears in there. No clutches for the friction modifier...
It's still modifying the fluid to make it more slippery for the torsen gears that are chattering? Just repeating what people have done, mine's an open diff so I don't have that issue.

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post #18 of 32 (permalink) Old 08-23-2019, 06:43 PM
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Make sure the seal on the bottle is intact before you leave the store. Some crooks pull return scams on oil by pouring something else in the bottle and getting a refund.

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post #19 of 32 (permalink) Old 08-23-2019, 06:49 PM Thread Starter
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Make sure the seal on the bottle is intact before you leave the store. Some crooks pull return scams on oil by pouring something else in the bottle and getting a refund.
Nothing surprises me anymore. It’s a shame.

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post #20 of 32 (permalink) Old 08-23-2019, 06:51 PM
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Is there a certain brand/type I need to use?
No, it's all the same, just needs to be limited slip differential additive.

I use K&W because the local autozone has it about as cheap as anyplace.

https://www.crcindustries.com/produc...oz-402508.html

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post #21 of 32 (permalink) Old 08-23-2019, 06:56 PM Thread Starter
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Quote:
Originally Posted by lilbxl View Post
Is there a certain brand/type I need to use?
No, it's all the same, just needs to be limited slip differential additive.

I use K&W because the local autozone has it about as cheap as anyplace.

https://www.crcindustries.com/produc...oz-402508.html
I read the bottle of the valvoline and it states it has “special additives” for limited slip🏼

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post #22 of 32 (permalink) Old 08-23-2019, 06:59 PM
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Quote:
Originally Posted by KATOOM View Post
I'm confused... I thought the 4th gen trucks have torsion differentials. Friction modifier does nothing for those.
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How can it help? There's nothing but gears in there. No clutches for the friction modifier...
Required for the gear type diff? No.

Does it help the grinding sticking issue in the gear type diff? Absolutely.

I had this issue with my truck, and after doing some research, came across a thread where someone else had this issue, believe it was on another forum. So, I tried it and it completely eliminated the issue.

So, if something that easy to do fixes the issue, I won't complain.
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post #23 of 32 (permalink) Old 08-23-2019, 07:02 PM
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Originally Posted by lilbxl View Post
I read the bottle of the valvoline and it states it has ďspecial additivesĒ for limited slip🏼
Some brands have more than others, try the valvoline without adding any more to it, if it still has the issue, you can always add a tube to it, only takes a few minutes.

And, if you fill the axle correctly, to just about 1/4"-3/8" below the fill plug, you will still have plenty of room to put the additive in.

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post #24 of 32 (permalink) Old 08-23-2019, 07:03 PM Thread Starter
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If it does it again, I will definitely put in the additive.

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