How often; if ever?

Eight

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How often does everyone change their rear diff fluid? I've almost got 100k on my truck and don't know if its ever been changed. I know that if you pull a trailer often your suppose to change it like every 20k.
 
I double checked with the manual and it says 150k

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Hmmm...I've always heard 20k with mid/heavy towing and 60k dd it. But I :hmm:
 
My rear pinion seal leaked at 67k so thats when the fluid got changed. Still havent done the front one yet and its at 84k.
 
Never it comes with lifetime fluid from the factory.
 
I did mine right at 100k cuz i noticed the diff cover was 'wet' so i didnt to be low on oil and burn up the diff...so i changed it..it was a little bit low but nothing concerning..i wont change it till i do my re-gear and locker swap..
 
really every 20k? i believe in the lifetime warranty from the factory too
 

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