Differential Fluid question

[greywolf2112]

So, if I understand correctly, my 2wd 1500 has only one (rear) differential, correct?

It has 60,000 miles on it (I bought it at that mileage) and have no idea if the fluid has ever been changed.

It appears that I have the 3.92 axle, and my research further leads me to (correct me if I'm wrong) that needing 75w140 fluid, correct? And I think it calls for 3 quarts?

If I am correct in all this, what would you recommend for my fluid change? Do I need to use the recommended 5 oz limited slip additive?

It appears that the 2wd 1500 with 3.92 axle is sort of rare?

 

[Wild one]

So, if I understand correctly, my 2wd 1500 has only one (rear) differential, correct?

It has 60,000 miles on it (I bought it at that mileage) and have no idea if the fluid has ever been changed.

It appears that I have the 3.92 axle, and my research further leads me to (correct me if I'm wrong) that needing 75w140 fluid, correct? And I think it calls for 3 quarts?

If I am correct in all this, what would you recommend for my fluid change? Do I need to use the recommended 5 oz limited slip additive?

It appears that the 2wd 1500 with 3.92 axle is sort of rare?

I wouldn't really call the 2X4's with 3.92s as rare,every 8 speed R/T has them,and alot of guys who order a truck order them with 3.92's,admittedly the 3.21's are more common,but i wouldn't put the trucks with 3.92's in the rare catagory.
Both Redline and Amsoil make decent diff fluids

 

[greywolf2112]

I wouldn't really call the 2X4's with 3.92s as rare,every 8 speed R/T has them,and alot of guys who order a truck order them with 3.92's,admittedly the 3.21's are more common,but i wouldn't put the trucks with 3.92's in the rare catagory.
Both Redline and Amsoil make decent diff fluids

Ah, thought I read that here about rarity. OK, so another dumb question - are all 3.92s Limited Slip? If not, how would I know if mine is and if I need to add that special 5 ounces of limited slip additive?

 

[Wild one]

Ah, thought I read that here about rarity. OK, so another dumb question - are all 3.92s Limited Slip? If not, how would I know if mine is and if I need to add that special 5 ounces of limited slip additive?

Not all 3.92's are limited slip,most are,but not all.The additive won't hurt an open/non limited slip diff,it's just as easy to use diff fluid that already has the additive though.If your checking out diff fluids,just make sure they list the fluid as having the additive

 

[greywolf2112]

OK - I found the Mopar stuff at a great price (around $18 a quart) and would have to get the additive. However, I'm open to already added stuff - I see Valvoline, Amsoil, Royal Purple, Mobil 1, Redline, etc. and all seem pretty highly rated.

 

[RamDiver]

Ah, thought I read that here about rarity. OK, so another dumb question - are all 3.92s Limited Slip? If not, how would I know if mine is and if I need to add that special 5 ounces of limited slip additive?

Enter your VIN at this site, then scroll about halfway down, between transmission and engine.
Or search differential with control F.

FCA RAM

fcagroup.my.site.com

.

 

[Wild one]

OK - I found the Mopar stuff at a great price (around $18 a quart) and would have to get the additive. However, I'm open to already added stuff - I see Valvoline, Amsoil, Royal Purple, Mobil 1, Redline, etc. and all seem pretty highly rated.

Any of those are decent diff fluids,pick the one that's easiest to get

 

[greywolf2112]

Enter your VIN at this site, then scroll about halfway down, between transmission and engine.
Or search differential with control F.

FCA RAM

fcagroup.my.site.com

View attachment 558638

.

Thank you - here's what it says:

3.92 REAR AXLE RATIO
ANTI-SPIN DIFFERENTIAL REAR AXLE

So, I assume that means I DO have the Limited Slip Differential?

 

[greywolf2112]

So, it shows a varying amount of how much fluid is needed - do you simply start filling until it starts coming out and cap it off? Any need to raise the front wheels so as to get more fluid in?

 

[nlambert182]

I think technically you're supposed to fill it to just below the fill hole (about a pinky nail distance), but most fill it until fluid just starts to weep from the filler. You may want to verify that for sure. I fill mine until it weeps.

Regardless, don't attempt to drain it until you've verified that you can remove the fill plug first.

 

[greywolf2112]

I've heard this is a messy job and often people have a mechanic do it - is that the case, or could this be a DIY job?

 

[Wild one]

I've heard this is a messy job and often people have a mechanic do it - is that the case, or could this be a DIY job?

If you can't change diff fluids on your own,you better hand in your man card
I'm pretty sure if you google diff fluid change,you'll find a bunch of video's on you tube showing how to do it

 

[greywolf2112]

If you can't change diff fluids on your own,you better hand in your man card
I'm pretty sure if you google diff fluid change,you'll find a bunch of video's on you tube showing how to do it

I should have done that before I asked - I think even my dog could do this, LOL.

 

[greywolf2112]

Any of those are decent diff fluids,pick the one that's easiest to get

Looks like the Valvoline will be easiest to get, has the LSD additive, and the packaging (squeeze pouch with nozzle) looks like it will be easy to put in there.

 

[greywolf2112]

Does anyone know if the Royal Purple has the LSD additive in it?

Nevermind - it does!

 

[nlambert182]

I used Valvoline the last time I changed mine. No issues to report.

 

[CanuckRam1313]

If you can't change diff fluids on your own,you better hand in your man card
I'm pretty sure if you google diff fluid change,you'll find a bunch of video's on you tube showing how to do it

 

[Wild one]

View attachment 558690

T.G. Sheppard and Clint Eastwood / Make My Day (1992)

www.youtube.com

 

[greywolf2112]

Do you guys use any type of thread locker on the fill and drain plugs? I was thinking of just using Permatex Thread Sealant with PTFE

https://www.amazon.com/dp/B000BKEBT0?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

I've seen some YT videos where people use RED loctite - uhm, really?

 

[Wild one]

Do you guys use any type of thread locker on the fill and drain plugs? I was thinking of just using Permatex Thread Sealant with PTFE

https://www.amazon.com/dp/B000BKEBT0?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

I've seen some YT videos where people use RED loctite - uhm, really?

I think you're over thinking this,the factory doesn't use pipe dope or thread locker on the plug.If you want to use pipe dope you can,but it's not really needed