Rear diffirential

[merv m]

How can i tell what differential i have under my 05 3500 swr, and does it require any special lubricant thanks

 

[Killer223]

11.5 GL-5. no need to go synthetic, unless you have extra money to spend.

 

[Prairie Dog]

As I understand it, Dodge factory filled it with synthetic and if you tow heavy it's well worth having.

 

[RVTRKN]

I agree with ^.

 

[sag2]

It was factory filled with synthetic for a good reason.

 

[merv m]

thanks for the reply do you know how many qts.it takes

 

[Bob4x4]

The factory fill was a 75/90 synthettic.a hair more than 3 qts will fill it to the recommended level

 

[merv m]

thanks Bob

 

[KATOOM]

If you tow close to or above the GVRW often, or in warm weather climates, or in the mountainous highways, then you'll probably want 75-140. I've monitored the differential temperatures with both the stock cover and with a Mag-Hytec and if you tow as I described.....you want a good synthetic 75-140. But if you live where freezing is more common then 75-90 is more what you're after. The capacity is 3.8 quarts so you'll need 4 quarts to get the job done.

 

[merv m]

If you tow close to or above the GVRW often, or in warm weather climates, or in the mountainous highways, then you'll probably want 75-140. I've monitored the differential temperatures with both the stock cover and with a Mag-Hytec and if you tow as I described.....you want a good synthetic 75-140. But if you live where freezing is more common then 75-90 is more what you're after. The capacity is 3.8 quarts so you'll need 4 quarts to get the job done.

thanks for info Katoom i do live in the mountains and it does get cold but i go down to southern cal. for the winter so maybe i'll try half 75/90 and half 75/140 should end up with 75/115

 

[KATOOM]

Maybe a 75w-110 is more what you're after then. I understand Amsoil and Redline are the only two, of the more common oils, who offer that intermediate weight.