I asked Lucas oils about adding friction modifiers to their dino 80/90 gear oil for a limited slip diff. The gear oil question is an age old debate that comes down to opinion. I am changing the diff fluid in my ford nine inch rear end. I got some CRC gear oil additive just in case there is an issue. This is borne out by the fact that most popular modern synthetic gear oils already have friction modifiers in them. 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. If limited-slip differential chatter occurs, add AMSOIL Slip-Lock™ Friction Modifier Additive. BTW, it's a very good gear lube. There was much chattering of the limited slip clutches when the truck mad a turn, and it … AMSOIL Slip-Lock Differential Additive is formulated with advanced friction modifiers and is designed to eliminate gear-housing chatter in cars, trucks and SUVs equipped with limited-slip, positraction and locking differentials. 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. Will not harm seals and does not contain petroleum distillates. Transmission Fluid and Gear Oil, 75W90, Limited Slip, Synthetic, 1 qt., Each. I kept getting "one wheel peel". I don't have Limited Slip, so I don't need the additive. 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. The stuff I just put in my diff was from Car Quest, Full Synthetic, 75W-90. Find Gear Lube Limited Slip Additive and get Free Shipping on Orders Over $99 at Summit Racing! Use with conventional GL-5 or synthetic gear oils. Uses this hypoid gear design where the diff make fluid pressure to drive the side gears to make a limited slip. Gonna put on my new mag-hytec rear diff cover on next wk. Eaton states: "Detroit Truetrac High quality mineral or synthetic gear lubes are required for use in Detroit Truetrac differentials. The gear oil question is an age old debate that comes down to opinion. If you do NOT have the G80, the gear lube with the additive in it won't hurt anything. 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. This was their response ...what do you think? I have done research and found that the 11.5 AAM axle is a Eaton Detroit Truetrac. If you look at most of the synthetic bottles they say they are good for limited slip. I want to change the fluid to Valvoline 75W 140 which is a full synthetic. In many cases, limited-slip differentials perform just fine with only AMSOIL Synthetic Gear Lube and no extra friction modifier added. Going to use Mobil 1 75W-90 LS. Dyno oil will mix with anything but synthetic usually doesn't. Our formula helps provide extreme pressure-wear resistance in any fluid system. ... Lucas Heavy Duty Plus Gear Oil. 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)?? We do not recommend synthetic fluids. My vehicle has a limited slip differential. ? Does not say it contains any friction modifier (LS Additive) in the product description or on the label Source AC Delco Product Catalog. 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 … Lucas is another "climbing" lubricant. 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." Mobil one makes an easy to find gear oil also as long as it is 75/140 synthetic your fine and most non OEM have the LS additive so you won't need to buy that like you would with the Ford brand if you have a limited slip i was at checker auto and they only had Royal Purple but I needed some so i … Redline makes a non-limited slip gear oil … I'm not sure I even got my head fully wrapped around the concept. For Best Results: Add one 4 oz. I'm using Mobil1 right now but since it contains the limited-slip additive I don't want to run it anymore since the G80 doesn't need it. I was having problems with my limited slip differential. For my Ford rear in my race/street car I run lucas gear oil and add a bottle of ford racing limited slip additive. TRANS-X makes a good additive that is available at any auto parts store and we also have it available for purchase. I could not get both wheels to spin at the same time. Thanks. The Lucas did not perform well in my trucks differential. We base our opinion on differentials we have seen. ... Red Line Oil 75W90 GL-5 rated with limited slip additive. I know this has the limited slip additive, but my questions is: do I need to add more LS additive or any other additive. AMSOIL Slip-Lock Differential Additive. Additional Information. See here for some words and specs and applications. Red Line Gear Oils already contain this additive (except the NS). Do bottles of gear oil have the additive? If you have a limited slip diff, you do need to add the motorcraft friction modifier - otherwise it will fry the clutches. Lucas Transmission Fix is a non-solvent formula designed to mix with your transmission fluid to stop slip, hesitation, and rough shifting in worn transmissions and eliminate seal leaks. 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.... . We base our opinion on differentials we have seen. I've been using it for many years without any problems. Used Mobil 1 that says limited slip friction modifier included but the Power Lock in my Dana 70 is chattering. The additive is not a lubricant. Applications: For axles equipped w/ limited slip, posi-traction, or traction equalizers, for … Before we answer the question Does Lucas transmission fluid work, we need to understand what Lucas additive is designed to do. 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. looking forward to better mpg as well as the gears have fresh lubricant to help my car run more smoothly. What does a limited-slip additive do? The label on the bottle says Limited Slip on the top corner of the label. In any case, some good quality API GL-5 gear lube will be fine for limited slip differentials including "Positraction". It meets all the specs and is cheaper than other synthetic fluids of the same viscosity (even cheaper than Supertech 75w-140 synthetic from Walmart). I picked up some Lucas fully synthetic 74W-140 gear oil that was stated to already have the limited slip modifier in the oil. Now I can get both wheels to hook up with no problem. 50 g is sufficient for 2.5 liters of gear oil. 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. 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:. 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. I have read some bad reviews of Lucas gear oils, but most seem to be complaining of issues in transmissions or transfer cases, not differentials, so I figured why not try it. Thanks J I was running 80W90 before with CRC limited slip additive. Edited February 3, 2017 by elcamino Hoping the rear diff doesn't have any limited slip problems with the lucas gear oil. Dave - many gear oil manufacturers add the limited slip additive to their gear lubes will work in both open diffs and those with limited slip. Suitable for both mineral and synthetic gear oils. However, diff chatter can occur in some cases. Hapco Limited Slip Additive effectively reduces wear, noise and chatter in differentials. 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. We recommend Lucas 75w/140 gear oil, Lucas 80w/90 gear oil is also acceptable. If there is noise driving in a straight line, it may be the differential, but not the limited slip function of it. Compatible with petroleum or synthetic gear oils. The bottle says, "Full Limited Slip Performance". All of the Lucas products I have used do what they say. Molyslip G – Gear Oil Supplement. Does that mean I don't need to add the limited slip additive? I find using straight gear lube with a bottle of motorcraft friction modifier to work best. Do all TRD Off Roads have a limited slip? Im going to be changing my gear oil. 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. TRANS-X POSI-TRAC Limited Slip Gear Oil Additive is designed to quiet chattering differentials and improve gear oil performance. Our 80w/90 has a friction modifier package already in the formula. I put some of the 85/140 gear oil in it. In non-limited-slip racing differentials and quick-change units using the Red Line ShockProof Gear Oils an additional 3 to 6% Red Line Limited-Slip Differential Friction-Modifier / Break-In Additive … Plates onto all gear drive surfaces; Produces a friction-reducing barrier that does not drain off IF you have a factory limited slip or any clutch style limited slip a limited slip additive will need to be added. Does this mean no additive is necessary? ... and I added the 1 liter+ of the Lucas VTwin Gear Oil to fill it up to the plug hole. ECGS recommends Dino (Non-Synthetic) 85w140 Lucas oil with a Ford or Dana limited slip additive for clutch style posi's. Lucas Oil 10043-1 - Lucas Heavy Duty Plus Gear Oil. 20 g is sufficient for 1 liter of gear oil. ECGS recommends Dino (Non-Synthetic) 85w140 Lucas oil with a Ford or Dana limited slip additive for clutch style posi's. Gear-Oil Additive: 21518: 50 g Tube plastic: F: Additional Information . 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