Rear diff ID

[Bugman]

Any particular reason why you use 75W 90 Instead of the recommended 75W 140?


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It works fine and even when I just ran straight gear lube all I ran was 90 weight

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[Bugman]

On the Royal Purple, it's a good lube.

On the friction modifier I haven't seen any lube that is rated GL-4 or greater that doesn't

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[Tiha]

I have always run Mobil 1. it is like 75w-140 I think. It is supposed to have the modifier in it, but I usually get a clunking and end up having to add it anyway.

There is nothing wrong with the 75w-90 or any other weights in that range. If you are changing it at all, that is more than most people ever do.

 

[ncollins64]

Why over complicate things. Just run the recommended weights. Rear gets 75w140 with friction modifier, and the front Dana 60 gets 80w90.

 

[JohnT24]

Done deal 75w90
Front & rear.


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[Powerstroke Cowboy]

85-140 non synthetic for me. Works good with no bad noises.