2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I'm getting ready to have the rear end oil changed and want to know what type of lube to use? I am thinking either Mopar or Royal Puprle. I like the Royal Purple oil but have heard bad things about their transmission fluid so I don't know about the gear oil. What weight should I get? I'm kind of leaning towards the Mopar brand just because thats what comes in it from the factory so I'm thinking it must be one of the best. I can get a discount on the Mopar also through my work but then again price isn't really a big deal I just want the best. What do you guys use?
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2001 Dodge Ram 1500 Offroad Edition with the 360.
i have the royal purple in mine , i bought that stuff, because they said you dont have to add any diff additive to it, 75-90w at summit, maybe about 9 months old and no problems, hopefully its good stuff, spendy though
It all depends on what type of differential you have. If it is an open diff, then yes, you just pour gear lube right in until it is full. If it is a limited slip differential, you will likely need a friction modifier, or else you will have chatter, and eventually destroy your limited slip. Some limited slip differentials can get by without friction modifier as long as you use a synthetic gear lube. However others (like my Auburn unit) specifically call for non-synthetic hypoid gear fluid, and Ford or GM friction modifier. I just depends if your limited slip is a gear driven, or clutch packs, or cone style. Cone and clutch usually require friction modifier.
My '99 1500 calls for 80w-90 in the front Dana 44, and 75w-90 in the rear corp 9.25. However, my rear limited slip also calls for 80-w90, so that is what I use all around now. You can tell if you have a limited slip by looking at the tag in your glovebox or on the door (can't remeber which place says it). But if you are not the original owner, you should make sure a previous owner didn't install one. Jack up the rear end just enough to free turn the tires. If turning one side in a forward direction causes the opposite tire to turn in a backward direction, you have an open differential. If both turn in a forward direction, you have a limited slip.
2009 Ram 1500, 4x4, Hemi
1999 Ram R.I.P. - April 2008 Truck of the Month / January 2012 Ride of the Month / Dodge Forum 2012 Truck of the Year