Lucas is another "climbing" lubricant. We do not recommend synthetic fluids. There was much chattering of the limited slip clutches when the truck mad a turn, and it … I know this has the limited slip additive, but my questions is: do I need to add more LS additive or any other additive. If you look at most of the synthetic bottles they say they are good for limited slip. The gear oil question is an age old debate that comes down to opinion. See here for some words and specs and applications. I could not get both wheels to spin at the same time. ... Lucas Heavy Duty Plus Gear Oil. 20 g is sufficient for 1 liter of gear oil. We base our opinion on differentials we have seen. And the additive in the modifier's are only their to quiet the action of the limited slip and prevent disc shutter. If you do NOT have the G80, the gear lube with the additive in it won't hurt anything. Thanks J ? ----- 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.... . Transmission Fluid and Gear Oil, 75W90, Limited Slip, Synthetic, 1 qt., Each. 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. 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. 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. 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. Just checking, don't want to have any problems. 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. Our formula helps provide extreme pressure-wear resistance in any fluid system. Use with conventional GL-5 or synthetic gear oils. I have seen alot of comments about "make sure you add limited slip additive" for the diffs. If you have a limited slip diff, you do need to add the motorcraft friction modifier - otherwise it will fry the clutches. 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. I picked up some Lucas fully synthetic 74W-140 gear oil that was stated to already have the limited slip modifier in the oil. 50 g is sufficient for 2.5 liters of gear oil. Hoping the rear diff doesn't have any limited slip problems with the lucas gear oil. 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. Redline makes a non-limited slip gear oil … The gear oil question is an age old debate that comes down to opinion. 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 kept getting "one wheel peel". For my Ford rear in my race/street car I run lucas gear oil and add a bottle of ford racing limited slip additive. Suitable for both mineral and synthetic gear oils. Does not say it contains any friction modifier (LS Additive) in the product description or on the label Source AC Delco Product Catalog. Going to use Mobil 1 75W-90 LS. Compatible with petroleum or synthetic gear oils. For Best Results: Add one 4 oz. What does a limited-slip additive do? I want to change the fluid to Valvoline 75W 140 which is a full synthetic. ECGS recommends Dino (Non-Synthetic) 85w140 Lucas oil with a Ford or Dana limited slip additive for clutch style posi's. 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:. looking forward to better mpg as well as the gears have fresh lubricant to help my car run more smoothly. I got some CRC gear oil additive just in case there is an issue. 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. TRANS-X POSI-TRAC Limited Slip Gear Oil Additive is designed to quiet chattering differentials and improve gear oil performance. Used Mobil 1 that says limited slip friction modifier included but the Power Lock in my Dana 70 is chattering. The Lucas did not perform well in my trucks differential. My vehicle has a limited slip differential. This is borne out by the fact that most popular modern synthetic gear oils already have friction modifiers in them. I don't have Limited Slip, so I don't need the additive. 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've been using it for many years without any problems. This was their response ...what do you think? If limited-slip differential chatter occurs, add AMSOIL Slip-Lock™ Friction Modifier Additive. We base our opinion on differentials we have seen. I would also use some of the Heavy Duty Oil Stabilizer in with the gear oil … Download Industrial PDF. Before we answer the question Does Lucas transmission fluid work, we need to understand what Lucas additive is designed to do. Gonna put on my new mag-hytec rear diff cover on next wk. The additive is not a lubricant. 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 … 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. I asked Lucas oils about adding friction modifiers to their dino 80/90 gear oil for a limited slip diff. Application: Add to the gear oil. All of the Lucas products I have used do what they say. Does this mean no additive is necessary? If there is noise driving in a straight line, it may be the differential, but not the limited slip function of it. Eaton states: "Detroit Truetrac High quality mineral or synthetic gear lubes are required for use in Detroit Truetrac differentials. Dyno oil will mix with anything but synthetic usually doesn't. 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. 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). Red Line Gear Oils already contain this additive (except the NS). ... and I added the 1 liter+ of the Lucas VTwin Gear Oil to fill it up to the plug hole. 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. Do bottles of gear oil have the additive? TRANS-X makes a good additive that is available at any auto parts store and we also have it available for purchase. Edited February 3, 2017 by elcamino 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." However, diff chatter can occur in some cases. Im going to be changing my gear oil. IF you have a factory limited slip or any clutch style limited slip a limited slip additive will need to be added. Don’t use it! Additional Information. Lucas Oil 10043-1 - Lucas Heavy Duty Plus Gear Oil. Our 80w/90 has a friction modifier package already in the formula. In any case, some good quality API GL-5 gear lube will be fine for limited slip differentials including "Positraction". The stuff I just put in my diff was from Car Quest, Full Synthetic, 75W-90. Do all TRD Off Roads have a limited slip? The bottle says, "Full Limited Slip Performance". Molyslip G – Gear Oil Supplement. ... Red Line Oil 75W90 GL-5 rated with limited slip additive. I was having problems with my limited slip differential. 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)?? 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. 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