2003 Dodge Ram 1500 Front Diff Oil Weight

[BDub1981]

Hey new guy here. I tried searching first before I asked the question, sorry if I missed the answer. Here is my question...

I was trying to pull the front axle on my 2003 Dodge 1500 (C205F differential) and decided to change the front diff oil while I was under there. Filled it with 75W-140. Well that is the weight for the rear diff. Should I drain the 75W-140 and put in the recommended 75W-90? Will the 75W-140 help or hurt anything?

 

[CT8]

The 75W-140 will not hurt anything, it may be thicker than needed

 

[BrianF]

75w140 will work but as far as I am aware 1500's only require 75w90. I would run it and if you ever put enough miles on it, put 90 weight in next change.

 

[SumpChump]

Originally Posted By: CT8
The 75W-140 will not hurt anything, it may be thicker than needed

Is ther a MUST have mopar diff additive (something about the "posi" or whatever Dodge calls it) that this gen of trucks use in the rear?

 

[BDub1981]

Thanks guys! I did use the 75W-140 Synthetic Valvoline with the friction additive already in it.

 

[zeng]

You could easily double the OCI with 75W140 in this front axle differential.

 

[userfriendly]

Zeng; I ended up buying Petro-Canada 80w140 which has the exact same specs as Eaton's label. www.eaton.com good to at least -32C using the doubling per 5C rule of thumb.
Taxes in, $200 Canuck bucks for 20 liters.

 

[zeng]

Originally Posted By: userfriendly
Zeng; I ended up buying Petro-Canada 80w140 which has the exact same specs as Eaton's label. www.eaton.com good to at least -32C using the doubling per 5C rule of thumb.
Taxes in, $200 Canuck bucks for 20 liters.

Concur with you.