Since there is nothing in any differential that is not in a limited-slip differential, there should be no harm in using a friction modifier in a non-limited-slip differential, although there is no need for it. I asked Lucas oils about adding friction modifiers to their dino 80/90 gear oil for a limited slip diff. I got some CRC gear oil additive just in case there is an issue. If limited-slip differential chatter occurs, add AMSOIL Slip-Lock™ Friction Modifier Additive. Do bottles of gear oil have the additive? The bottle says, "Full Limited Slip Performance". My question is, does API GL-5 gear oil have the limited slip additive in it or do I need to buy the additive (or this info vary from brand to brand)?? Redline makes a non-limited slip gear oil … My vehicle has a limited slip differential. Just checking, don't want to have any problems. Will not harm seals and does not contain petroleum distillates. I've been using it for many years without any problems. I meant to say I didn't want to spend $30 a quart on the GM stuff when I can get Amsoil or Redline for $15 a quart. ECGS recommends Dino (Non-Synthetic) 85w140 Lucas oil with a Ford or Dana limited slip additive for clutch style posi's. BTW, it's a very good gear lube. I run 80w90, LS gear oil in mine, (the LS is limited slip).If you have a limited slip diff and you don't use additive or oil with the additive already in it you will burn out the LS plates and end up with an open diff.I can't remember how much it holds, but fill it up to … I have seen alot of comments about "make sure you add limited slip additive" for the diffs. Does that mean I don't need to add the limited slip additive? Suitable for both mineral and synthetic gear oils. The label on the bottle says Limited Slip on the top corner of the label. Gear-Oil Additive: 21518: 50 g Tube plastic: F: Additional Information . I am changing the diff fluid in my ford nine inch rear end. Red Line Gear Oils already contain this additive (except the NS). I put some of the 85/140 gear oil in it. For my Ford rear in my race/street car I run lucas gear oil and add a bottle of ford racing limited slip additive. ... and I added the 1 liter+ of the Lucas VTwin Gear Oil to fill it up to the plug hole. TRANS-X makes a good additive that is available at any auto parts store and we also have it available for purchase. See here for some words and specs and applications. Use with conventional GL-5 or synthetic gear oils. Find Gear Lube Limited Slip Additive and get Free Shipping on Orders Over $99 at Summit Racing! I want to change the fluid to Valvoline 75W 140 which is a full synthetic. Dyno oil will mix with anything but synthetic usually doesn't. If there is noise driving in a straight line, it may be the differential, but not the limited slip function of it. Don’t use it! What does a limited-slip additive do? Lucas Oil 10043-1 - Lucas Heavy Duty Plus Gear Oil. Pinion bearing, carrier bearings, wheel bearings can all go bad, irrelevant of LS additive, but not adding the additive is probably not related, IF it is a bearing. However, diff chatter can occur in some cases. If you have a limited slip diff, you do need to add the motorcraft friction modifier - otherwise it will fry the clutches. Mixing takes place automatically during operation. Instead of formulating multiple gear lubes of the same viscosity, but different frictional properties, to address occasional chatter in limited-slip differentials, gear-lube friction-modifier additives can be used to alter the fluid’s original frictional properties and eliminate chatter. Instead of formulating multiple gear oils of the same viscosity, but different frictional properties to address occasional chatter in limited-slip differentials, you can use a gear-lube additive that alters the fluid’s original frictional properties and eliminates chatter. Molyslip G – Gear Oil Supplement. I know this has the limited slip additive, but my questions is: do I need to add more LS additive or any other additive. Do all TRD Off Roads have a limited slip? TRANS-X POSI-TRAC Limited Slip Gear Oil Additive is designed to quiet chattering differentials and improve gear oil performance. There was much chattering of the limited slip clutches when the truck mad a turn, and it … Transmission Fluid and Gear Oil, 75W90, Limited Slip, Synthetic, 1 qt., Each. I'm not sure I even got my head fully wrapped around the concept. If you have a limited slip ( with a clutch pack in the carrier) use a limited slip gear lube or straight gear lube with a bottle of limited slip additive. We do not recommend synthetic fluids. The Lucas did not perform well in my trucks differential. The gear oil question is an age old debate that comes down to opinion. I don't have Limited Slip, so I don't need the additive. Molyslip G Gear Oil Supplement is a suspension of molybdenum disulfide (MoS2) in a high quality multi-viscosity gear oil with extreme pressure, antifoam and adhesion additives that:. I kept getting "one wheel peel". I could not get both wheels to spin at the same time. I picked up some Lucas fully synthetic 74W-140 gear oil that was stated to already have the limited slip modifier in the oil. Our 80w/90 has a friction modifier package already in the formula. In many cases, limited-slip differentials perform just fine with only AMSOIL Synthetic Gear Lube and no extra friction modifier added. If it was me, I'd take the Lucas and additives back, and check some Pennzoil or Quaker State or other brand name GL-5 spec and see if it covers limited-slip. 20 g is sufficient for 1 liter of gear oil. This is borne out by the fact that most popular modern synthetic gear oils already have friction modifiers in them. Applications: For axles equipped w/ limited slip, posi-traction, or traction equalizers, for … The additive is not a lubricant. Haven't done any figure 8's and have about 150 miles on it now but have never done figure 8's with anything else for the last 30+ years and have been fine. On the SynPower Gear Oil bottle it says it's for Limited Slip, and on-line they say "The addition of a supplemental friction modifier (Ford M2C-118-A, Chrysler MS-5630, or GM 1052358) is not required." I would also use some of the Heavy Duty Oil Stabilizer in with the gear oil … ----- Then there is this for limited slip..... 88862624 Dexron LS Gear Oil 75W-90 Synthetic EP Gear Lube with Limited Slip Additive You be the judge.... . Gonna put on my new mag-hytec rear diff cover on next wk. The gear oil question is an age old debate that comes down to opinion. Going to use Mobil 1 75W-90 LS. Compatible with petroleum or synthetic gear oils. We base our opinion on differentials we have seen. Plates onto all gear drive surfaces; Produces a friction-reducing barrier that does not drain off We recommend Lucas 75w/140 gear oil, Lucas 80w/90 gear oil is also acceptable. I was running 80W90 before with CRC limited slip additive. Hoping the rear diff doesn't have any limited slip problems with the lucas gear oil. Does this mean no additive is necessary? I have an ‘18 Ram 1500 with the 9.25ZF rearend, I put 1 qt Lucas Syn Oil stabilizer in and filled the rest with syn 75W-140, and after hearing how it can airate and bubble, I drove the truck for 10 min at highway speed, pulled the filler cap and the fluid came pouring out very bubbly and foam-like. ? Be cautious of trying to add any additives to a synthetic fluid as most of the time they don't mix very well or give you the "protection" you think your getting. This was their response ...what do you think? looking forward to better mpg as well as the gears have fresh lubricant to help my car run more smoothly. 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