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I have a 2003 Dodge ram 1500 2WD with 125k miles on it. I just bought the truck last year and barely put 10k miles on if that.
Ive changed the oil religiously, and last two times the tech asked about rear differential oil. They said its usually due for changing at 80k, but didnt look terribly bad and I could wait til next oil change which was couple months ago.
Id like to change it out myself and save the $90 if I can.
My question is, what type of gear oil would be best for this mileage?

I read on this forum the following and would like to know if this is good advice. its posting was back in 2005 though, so not sure if anything better has come along since then.

"Materials Needed, Three (3) Quarts of 85 W 140 Gear Oil, I used Valvoline
Synthetic Blend ($5.00 a bottle) instead of Mobil-1 Full Synthetic ($16.00
a bottle)
One (1) Tube of Ultra Copper RTV Silicone ($3.98 @ Discount / Advanced Auto)
One (1) 7oz tube of LSD or Tract Lok lube (Instructions say to use all 7oz
and the manual says to use 4oz .. I used all 7oz) ($5.00 @
Discount/Advanced Auto)

Total job used 2 - Qt's and One (1) 7oz tube of Tract Lok Lube, Two (2)
Razor blades and One (1) tube of Ultra Copper RTV Silicone."

Thanks in advance for any help.
 

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If you have the anti-slip diff you really need to pull the cover and do fluid changes more often than 80k. Look for clip fragments. The factory fill is 75W-140 + whatever friction modifier may be needed.
 

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Toothy Critters Rock!
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7,238 Posts
I'm fond of the royal purple lube 75-140
(although I'm using 85-140 non syn with DTT now.)
it takes about 2 1/2-2 3/4 quarts.
RP doesn't require friction modifier other brands do.
RTV.. I use ultra black or red.
and use Brake clean to clean things and help remove old sealant
and to final prep the surfaces before running the sealant bead

Overall it's a pretty simple job, I do it a couple times a year or more.
cover bolts are specified to be 30 ft lbs torque
 
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