Differential Additives

[Bt10]

It would be perfectly fine. The gears and bearings are the same no matter the carrier type. You should youtube a differential.

"Standard" ratio??

 

[HSKR R/T]

All,
I'm in the learning phase as well.
So I am sure I have just a regular rear axle in the 4x4 truck with no special gears.
So what happens if one were to add the Mopar Friction Modifier fluid when doing the fluid change along with the required rear-end gear oil to a standard ratio, standard rear-end differential?
Just curious if this would be detrimental?
I can't be the only one that has this question rattling around in my head.

BlueHemi1500

Will not hurt anything. Just waste of money on additive you don't need.

 

[Jesusisgod]

Woops - yeah, so that’s new info. If the front is as easy as the back, then I might do that next weekend. Thanks!

For the back, the torque specs I used are 18ft lbs for the 8MM and 44 for the 14MM - tho, you can get by with ‘feel’ since you will be loosening them. I see that question asked a lot with no definitive answer.

So I got both front and rear done. I ended up doing the rear 2 times because of dirty it was. I wanted to get every bit of whatever it was out. A mechanic at my work said, they don't clean off the grease that the gears are packed in before filling the diff. I can believe that given the stuff felt like grease and stuck to everything like packing grease. It was a blackish almost gunpowder grey color. Magnets wouldn't attract it. I could clearly see glitter a couple thin rice sized shavings, and this greasy stuff separate from one another. So idk.

Anyways hopefully I'm replying in time to save you the trouble. The front even though that drive shaft is spinning looked like brand new fluid. Idk how. I guess the gears inside don't spin some how untill 4x4 is actually turned on. Still glad I did simply because now both front and rear are filled with amsoil.

Man I wish I woulda known just how awful that stuff smells. Thankfully my buddy told me not to wash those clothes in my washer.

 

[Richard320]

Man I wish I woulda known just how awful that stuff smells. Thankfully my buddy told me not to wash those clothes in my washer.

You haven't lived until you've done a clutch on your back in the driveway and ended up with a 90 weight shampoo.

 

[Jesusisgod]

You haven't lived until you've done a clutch on your back in the driveway and ended up with a 90 weight shampoo.

O no what's that smell like? When I came in covered in the gear oil my wife said I smelt like a fishes vigina **** out a poop .

 

[BlueHemi1500]

Thank you all who responded to my question.
I think my standard rear gear ratio is 3.21 or something close to that number(s), I am not a mechanic. no locker, no anti-spin rear, just the factory default rear end vs. all the other factory options you can order. I got my truck Nused so it came as it is and that was fine as I do not tow and do very little "off-roading" nothing technical at least.

BlueHemi1500

 

[Tinscrew]

So I got both front and rear done. I ended up doing the rear 2 times because of dirty it was. I wanted to get every bit of whatever it was out. A mechanic at my work said, they don't clean off the grease that the gears are packed in before filling the diff. I can believe that given the stuff felt like grease and stuck to everything like packing grease. It was a blackish almost gunpowder grey color. Magnets wouldn't attract it. I could clearly see glitter a couple thin rice sized shavings, and this greasy stuff separate from one another. So idk.

Anyways hopefully I'm replying in time to save you the trouble. The front even though that drive shaft is spinning looked like brand new fluid. Idk how. I guess the gears inside don't spin some how untill 4x4 is actually turned on. Still glad I did simply because now both front and rear are filled with amsoil.

Man I wish I woulda known just how awful that stuff smells. Thankfully my buddy told me not to wash those clothes in my washer.

My experience was exactly the same as yours, down to the smell, rear sludge and front being very clean. Hard to see the gunk that settled at the bottom in the photo

 

[RVTRKN]

I believe it said antispin rear differential. To my knowledge they are the same thing. I don't have the window sticker beside me right now. But on the ram app it says my options. As far as I know it's correct. View attachment 185892

All,
I'm in the learning phase as well.
So I am sure I have just a regular rear axle in the 4x4 truck with no special gears.
So what happens if one were to add the Mopar Friction Modifier fluid when doing the fluid change along with the required rear-end gear oil to a standard ratio, standard rear-end differential?
Just curious if this would be detrimental?
I can't be the only one that has this question rattling around in my head.

BlueHemi1500

Window Sticker Lookup by VIN

Use your VIN number to get your Buick, Cadillac, Chevrolet, Chrysler, Dodge, FIAT, Genesis, GMC, Hyundai, Jeep, or RAM Window Sticker

windowstickerlookup.com

 

[RVTRKN]

Also a good read. Valvoline 75W-90 full synthetic differential oil

 

[jman307]

It looks like on amsoil, they say to still add 5 oz of the mopar limited slip additive. For a 2024 1500 bighorn with 3.21 diff. It also says the capacity is 4.2 pints. If I'm mathing correctly. That means total it'll be 4.5 pints, 4.2 being 75w-90, and .3 pints of the mopar slip additive?

Also if I'm reading on here correctly. The front differential only needs 75w-90. It does not get the additional mopar additive?

So if what I'm told is correct. the front differential isn't a limited slip. It is an open diff that uses the brakes to slow the spin if one side is spinning and the other isn't?

My next question would be what changed between the years from 2020 to 2024. That the oil capacity went from 5.68 to 4.2?

This will be the first time ive done a differential fluid change. So my plan is to follow my friends advice. As well as a few YouTube channels.

Drain fluid on rear. Put in 5 oz of mopar additive. Fill with 75w-90 till it just stsrts to drip from fill hole. Then close up.

On the front. Drain then fill only with 75w-90 till it just starts to drip from the fill hole. Close up and done.

Any advice or corrections to what I'm wrong about is greatly appreciated! Thank you in advance.

It looks like on amsoil, they say to still add 5 oz of the mopar limited slip additive. For a 2024 1500 bighorn with 3.21 diff. It also says the capacity is 4.2 pints. If I'm mathing correctly. That means total it'll be 4.5 pints, 4.2 being 75w-90, and .3 pints of the mopar slip additive?

Also if I'm reading on here correctly. The front differential only needs 75w-90. It does not get the additional mopar additive?

So if what I'm told is correct. the front differential isn't a limited slip. It is an open diff that uses the brakes to slow the spin if one side is spinning and the other isn't?

My next question would be what changed between the years from 2020 to 2024. That the oil capacity went from 5.68 to 4.2?

This will be the first time ive done a differential fluid change. So my plan is to follow my friends advice. As well as a few YouTube channels.

Drain fluid on rear. Put in 5 oz of mopar additive. Fill with 75w-90 till it just stsrts to drip from fill hole. Then close up.

On the front. Drain then fill only with 75w-90 till it just starts to drip from the fill hole. Close up and done.

Any advice or corrections to what I'm wrong about is greatly appreciated! Thank you in advance.

Does Amsoil not recommend their Slip Lock differential additive, only Mopar brand? I’m trying to find this verbiage on their website and cust svc is closed for the weekend

 

[HSKR R/T]

Does Amsoil not recommend their Slip Lock differential additive, only Mopar brand? I’m trying to find this verbiage on their website and cust svc is closed for the weekend

Doesn't really matter what brand friction modifier/additive you use.

 

[RVTRKN]

However you must add the friction modifier additive, regardless. https://www.amsoil.com/p/amsoil-slip-lock-differential-additive-adatb/

 

[Jesusisgod]

Does Amsoil not recommend their Slip Lock differential additive, only Mopar brand? I’m trying to find this verbiage on their website and cust svc is closed for the weekend

you do got to add it like the other fellow said. i spoke on the phone with amsoil. with the truck under warranty they said we recommend using the mopar additive.

 

[jman307]

you do got to add it like the other fellow said. i spoke on the phone with amsoil. with the truck under warranty they said we recommend using the mopar additive.

Copy that much appreciated, the tech rep I spoke with at Amsoil said NOT to use it but now I will call again. Should not be like this with poor info from a reputable company

 

[Jesusisgod]

Copy that much appreciated, the tech rep I spoke with at Amsoil said NOT to use it but now I will call again. Should not be like this with poor info from a reputable company

Did they say do not use it, or you don't have to use it. Cause I got "you do not have to." That's 2 different vastly different answers.

I my first reply I ment by you have to add it. As in the dealer will not warranty if it's not been added. If it's under warranty, add it it's not gonna hurt anything. It'll cover you if something breaks, and the dealer says well you didn't add this so you're at fault.