Rear Differential Fluid
#1
Registered User
Thread Starter
Rear Differential Fluid
I have a 2012 3500 dually and getting ready to replace my rear brake rotors. I expect to lose a small amount of fluid when I pull the axles and I'm not sure weather to top off the fluid with synthetic or non synthetic oil. I'm just sure its going to be 75w-90.
#2
Cummins Guru
Always use synthetic oil in HD differentials and when used for towing. Synthetic does not break down under high temperatures.
#3
Registered User
Since RAM started using AAM axles back in 2003, they have all been shipped with GL5 75W90 synthetic.
The following users liked this post:
BobWatts (11-20-2017)
The following users liked this post:
BobWatts (11-20-2017)
#6
Registered User
Thread Starter
Trending Topics
#10
Registered User
Would filling a 2017 3500 chassis cab diffs with 75-140 hurt anything? We have a bunch of it for the old trucks laying around, trying to keep things simple....
#11
Registered User
I think 75/90 is entry level. I use syn 85/140 in all my trucks for heavy towing. That's the only weight that keeps the metal off the magnet, for me. I figure mpg every tank and no decrease form the heavy stuff. Craig
#12
Registered User
Thanks, I’ll remember the “metal off the magnet” comment for a long time.
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