The Owners manual will tell ya the spec's. Pretty much all Jeep Dana 44 rear & front rear ends & the Dana 30 used in front on non Rubicon models come with conventional 80/90 GL5 rated gear oil. If your Jeep has a tow package it will have a 75/140 GL5 rated synthetic in the rear Dana 44 (if you have a track lock limited slip rear end don't forget to add the limited slip additive pack to the gear oil you choose to use) You can run the 75/140 in the front as well and is recommended for heavy duty applications for the Dana 44 by Dana.
I have a Rubicon with both front and rear Dana 44 rear ends and the tow package. I run Valvoline Synthetic 75/140 in both rear ends the Valvoline gear oil has the Chrysler MS spec rating right on the bottle. The gear oil has done a fine job so far.
As long as it's a good name brand quality GL5 rated gear oil you will be fine. Just pick the weight 80/90 conv 80/140 conv or 75/90 synthetic or 75/140 synthetic that fits your needs and the brand you like. They will all do the job.
Depending on the year of your Jeep more than likely the transfer case probably has ATF+4 Chrysler spec automatic trany fluid in it. Your owners manual will verify this as well so you can get the right stuff.
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