I am an idiot: limited slip additive, will it harm my diffs??? (2012 Power Wagon)

87GMCJimmy

87GMCJimmy

Well-Known Member
Joined
Apr 24, 2007
Location
Mint Hill, NC
Well CRAP!!! So… changed my diff oil yesterday, cleaned my locker magnets really nice, installed my GP101 diff magnets, replaced my front axle breather tube (had a big gaping tear in it, prompting all this), and installed my Carli diff guard. Decided to change my rear diff oil too while I was at it. Truck is a 2012 Power Wagon, manufacturer's specs call for 75w90 and say limited slip additive not needed.

BIG ISSUE!!!!!!: Woke up this morning and realized I have a problem- I didn't notice it yesterday but, the 75w90 I bought has (noted in the tinyest letters on the whole bottle) "limited slip friction modifier included" so, how f-ed up is my truck now? I've only driven it about 40 feet- just moved it out of my wife's spot on the driveway and into mine. What should I do? Is just draining and replacing the fluid going to be enough or do I need to figure out a way to flush it out? (can't use brake clean to clean it out, it eats up the locker's wiring) Am I royally f-ed??? I can't believe I didn't notice it had the modifier but dang the print is small!!! (Yeah, I now realize it does say LS but, in ten times looking at the dang bottle I never noticed it, DOH!!!! I feel like a total idiot now that I see it!) Will it harm my lockers???

Thanks!!!
 
This thread delivers....between the panic grief stricken OMG!!!!!! AXLE Death!!!! Question

To Jody...sipping a cup of coffee...Fawk it. its fine.
 
I've never heard of additive included in the gear oil? I'll be reading the fine print for now on but what if you add additive and the oil already had it in it???
 
6BangBronk said:
I've never heard of additive included in the gear oil? I'll be reading the fine print for now on but what if you add additive and the oil already had it in it???
Click to expand...

Here's what I (mistakenly) used:
athelubricantstore.com_media_catalog_product_cache_2_image_37085effc2370ca1ad1523ccd25751e7ce5.png
:

Yeah, I know, looking at it now, it's really obvious that it's for limited slips (Synthetic Gear Lubricant LS) but, honestly, I looked at the bottles ten times before I noticed the LS. Heck, I didn't even notice the "Limited Slip Friction Modifier Included" line until this morning, that's some tiny subtle print there! (still somehow noticed that small print well before I noticed the LS (looked at it three more times and didn't notice the LS, DOH!!!!)) They used to make the LS a LOT more obvious, like this (the biggest print on the bottle other than the brand!):
ashop.advanceautoparts.com_wcsstore_CVWEB_staticproductimage__f16c9b1e023a61bb8f19508d4686003b.jpg
 
6BangBronk said:
I've never heard of additive included in the gear oil? I'll be reading the fine print for now on but what if you add additive and the oil already had it in it???
Click to expand...

About 80% of the gear oil part's stores sell have a limited slip additive in them. At least from what I've seen.
 
Even the limited slip axles in newer Dodges only require synthetic fluid. Reason is the unit uses no clutches or friction disc of any sort. Uses this hypoid gear design where the diff make fluid pressure to drive the side gears to make a limited slip. I'm not sure I even got my head fully wrapped around the concept. And the additive in the modifier's are only their to quiet the action of the limited slip and prevent disc shutter. Seems the average consumer wanted a fancy traction device you couldn't tell was their, so the modifier was added. At least that's the story I got from FORD.
 
:lol: Greatest thread ever!
 
Gary- I appreciate the offer, that's good of you man!!! LOL! :p :lol: :D

Thanks for all the quick responses y'all! (and humor too!) I was in quite a panic!!! Feeling a lot happier about the whole thing now. I still feel like an idiot but, at least I know my truck will be okay! Thanks everybody!
:beer:
 
Made me go check mine, but my Old bottle is not LS. First I've seen. Once I "Thought" it would be ok to replace the modifier, with Synthetic; What could be slicker? Locked up my cones/clutches!

HEY? What's everybody UP for? If I wasn't meeting Family for breakfast, I'd still be in bed!:(
 
For what it's worth that's the only synthetic they make now and the bottle states it for standard and limited slip diffs. Also says you can add additional additive.
 
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