What weight gear oil???

[AKDrifter]

^^^
So 40,000 miles or 4 years for the axles and 6/60 for the transfer case under severe use.

Yes it's not very frequent. I do my T-case the same time as I do my transmission fluid though every 2 years. Mine will be due for it again in October. I didn't realize until I was almost at 30k miles that you even had to change the transmission fluid but you do on the 6 speeds. I do the axles every October unless I have done a deep water crossing and then I'll change fluid then. Always handy to have some squeeze bags of Severe Gear handy.

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[alpineovernappa]

Interesting that it only stipulates to change the diff fluid for "police, taxi, fleet, offroad and trailer-tow" applications. One could argue this verbiage suggests the gear oil is otherwise implied to be a lifetime fluid with no maintenance interval. (There is no such thing as a lifetime fluid, I'm not saying to neglect maintaining your diffs)

 

[Hootbro]

Interesting that it only stipulates to change the diff fluid for "police, taxi, fleet, offroad and trailer-tow" applications. One could argue this verbiage suggests the gear oil is otherwise implied to be a lifetime fluid with no maintenance interval. (There is no such thing as a lifetime fluid, I'm not saying to neglect maintaining your diffs)

Like the "Lifetime" transmission fluid fill. More marketing to get you past the warranty and for them to advertise a lower maintenance cost.

 

[ShadowsPapa]

Yeah, but big differences between automatic transmission fluid and hypoid gear oil.
Until I started digging in Jeep forums, I never ran across anyone who changed differential lube at anything less than 100,000 miles, and even towing, it was not a frequent thing.
It seemed to be mainly a "Jeep thing". We never once had anyone come in and request differential fluid service other than check and add as needed.
Wreckers got different treatment, but pickups? Just didn't happen.

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