2020 1500 3.92 diff fluid. ?

[jc312]

Trying to figure out what diff fluid I need to service with. It has 3.92 ratio and the axle lock feature. Unsure about limited slip tho...

Tried several times this morning to pull up a build sheet using my vin, and I'm sure Im typing it in correctly, but nothing ever pulls up...

Are locking axles by definition not limited slip? Or is there any other way to find out? Thanks

 

[BowDown]

You mean e-lockers? No, they are open until locked but I doubt using a LS additive would harm it

 

[jc312]

Its got an "axle lock" button, that locks both rear wheels aka positive traction.. I think is the word.

But also has traction control, and another button to disable that

Seems I read a year or so ago that having the axle lock button means its not limited slip. ?

 

[Ramintime]

Its got an "axle lock" button, that locks both rear wheels aka positive traction.. I think is the word.

But also has traction control, and another button to disable that

Seems I read a year or so ago that having the axle lock button means its not limited slip. ?

Correct, you do not need the additive as the locker is different from the LSD. You could put in a additive as it won't hurt or help anything. Just go by the oil weight of what the manual says, most gear oil already has a small amount of fiction modifier in it anyway.

 

[jc312]

Correct, you do not need the additive as the locker is different from the LSD. You could put in a additive as it won't hurt or help anything. Just go by the oil weight of what the manual says, most gear oil already has a small amount of fiction modifier in it anyway.

Appreciate the reply. I still wish I was 100% sure. I guess at this point I'm around 98-99% lol

So if I turned off traction control and got on a dirt road and stomped it, there would be two spin marks if it had limited slip? Or would somehow not spin

And only one spin mark if it wasnt... ?

Something else I just read is you can jack up the rear of the truck and spin one tire. If the other spins the same direction, its limited slip.

Im just a little nervous about possibly messing something up. I guess the easy thing would be to just add the friction modifier and forget about it. But would still just like to know what the heck Ive got

 

[PurpleRT]

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[BowDown]

Appreciate the reply. I still wish I was 100% sure. I guess at this point I'm around 98-99% lol

So if I turned off traction control and got on a dirt road and stomped it, there would be two spin marks if it had limited slip? Or would somehow not spin

And only one spin mark if it wasnt... ?

Something else I just read is you can jack up the rear of the truck and spin one tire. If the other spins the same direction, its limited slip.

Im just a little nervous about possibly messing something up. I guess the easy thing would be to just add the friction modifier and forget about it. But would still just like to know what the heck Ive got

You've got an e-locking diff, that means its open til you hit the axle lock button so you can use diff/gear oil without the additive but if you go with a synthetic, it will have the additive anyway. You're fine with any gear oil provided its the right weight. Thats 100%

 

[kapinallinen2]

If the other spins the same direction, its limited slip.

That is old school limited slip.
Ram limited slip only engages with enough differential side loading that puts pressure on the clutch plates, during a fairly hard acceleration.
You have an e-locker if you have the axle lock button, 100% no doubt.

 

[Rebob0510]

I have basically the same truck, 2020 with 3.92 and electronic locker. I went with Valvoline Full Synthetic 75-140 in the plastic pouch, It made it very easy to refill. I went with (3) quarts to ensure I had enough. I did NOT add the LSD additive to mine. On a side note when I dumped the oil at 80K it looked pretty much new still. I bought the truck with 30k so unless the first owner changed it, it was still the OEM oil

 

[jc312]

I have basically the same truck, 2020 with 3.92 and electronic locker. I went with Valvoline Full Synthetic 75-140 in the plastic pouch, It made it very easy to refill. I went with (3) quarts to ensure I had enough. I did NOT add the LSD additive to mine. On a side note when I dumped the oil at 80K it looked pretty much new still. I bought the truck with 30k so unless the first owner changed it, it was still the OEM oil

That's good to know! Mines only got 55k, but got about 10k towing a camper.

I changed my other truck df today, a 93 toyota pickup with 120k, and it didn't look bad really. Good chance its the original fluid, but can't be sure. Bought it with 88k

 

[jc312]

Really appreciate all the help, thanks alot!

My next plan is to change the transmission fluid & filter. Looks like a bit of work from what Ive seen. One question that would help me decide if I want to try it myself. Can it be done without lifting the truck? Ive watched videos where the truck was put in 2nd gear while lifted as part of the process, but have heard it can be done on the ground as well...

 

[kapinallinen2]

Really appreciate all the help, thanks alot!

My next plan is to change the transmission fluid & filter. Looks like a bit of work from what Ive seen. One question that would help me decide if I want to try it myself. Can it be done without lifting the truck? Ive watched videos where the truck was put in 2nd gear while lifted as part of the process, but have heard it can be done on the ground as well...

Needs to be on jack stands in order to drop the y-pipe, at least this is what I did.

 

[Rebob0510]

Really appreciate all the help, thanks alot!

My next plan is to change the transmission fluid & filter. Looks like a bit of work from what Ive seen. One question that would help me decide if I want to try it myself. Can it be done without lifting the truck? Ive watched videos where the truck was put in 2nd gear while lifted as part of the process, but have heard it can be done on the ground as well...

I can chime in on this also LOL. I changed the pan/fluid on my truck around the same time I did the rear end oil. I changed mine with the front tires on ramps and jack stands under the rear end so the tires could rotate when you do the fill procedure. I dont think it would be very fun to do on the ground with the limited space, It wasn't fun on the ramps but also wasn't horrible. I went with a PPE aftermarket pan that holds a few more quarts then the stock pan and also has a replaceable filter unlike the stock pan. If I still own the truck and change the fluid again next time will be filter/oil and not the whole pan like the OEM one forces you to do. I removed the bolts like in the video and raised the transmission to gain the clearance to remove the pan, Here in NY I didnt dare try to take my exhaust apart like Kapinallinen2 did LOL

Its honestly not that bad of a job. I used this video as my guide....