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. 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)?? AMSOIL Slip-Lock Differential Additive. Plates onto all gear drive surfaces; Produces a friction-reducing barrier that does not drain off 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 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 … In many cases, limited-slip differentials perform just fine with only AMSOIL Synthetic Gear Lube and no extra friction modifier added. Do bottles of gear oil have the additive? Our formula helps provide extreme pressure-wear resistance in any fluid system. Don’t use it! If there is noise driving in a straight line, it may be the differential, but not the limited slip function of it. Find Gear Lube Limited Slip Additive and get Free Shipping on Orders Over $99 at Summit Racing! The stuff I just put in my diff was from Car Quest, Full Synthetic, 75W-90. Now I can get both wheels to hook up with no problem. 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. 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. Thanks J However, diff chatter can occur in some cases. I'm not sure I even got my head fully wrapped around the concept. ... and I added the 1 liter+ of the Lucas VTwin Gear Oil to fill it up to the plug hole. I put some of the 85/140 gear oil in it. If you do NOT have the G80, the gear lube with the additive in it won't hurt anything. For Best Results: Add one 4 oz. 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 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. ? I have seen alot of comments about "make sure you add limited slip additive" for the diffs. Will not harm seals and does not contain petroleum distillates. ... Red Line Oil 75W90 GL-5 rated with limited slip additive. We base our opinion on differentials we have seen. 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. The gear oil question is an age old debate that comes down to opinion. See here for some words and specs and applications. The gear oil question is an age old debate that comes down to opinion. All of the Lucas products I have used do what they say. 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:. Does not say it contains any friction modifier (LS Additive) in the product description or on the label Source AC Delco Product Catalog. Application: Add to the gear oil. Just checking, don't want to have any problems. ECGS recommends Dino (Non-Synthetic) 85w140 Lucas oil with a Ford or Dana limited slip additive for clutch style posi's. Our 80w/90 has a friction modifier package already in the formula. I find using straight gear lube with a bottle of motorcraft friction modifier to work best. Hapco Limited Slip Additive effectively reduces wear, noise and chatter in differentials. Uses this hypoid gear design where the diff make fluid pressure to drive the side gears to make a limited slip. 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. Mixing takes place automatically during operation. 20 g is sufficient for 1 liter of gear oil. I was running 80W90 before with CRC limited slip additive. For my Ford rear in my race/street car I run lucas gear oil and add a bottle of ford racing limited slip additive. The additive is not a lubricant. Applications: For axles equipped w/ limited slip, posi-traction, or traction equalizers, for … I could not get both wheels to spin at the same time. 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. ... Lucas Heavy Duty Plus Gear Oil. 50 g is sufficient for 2.5 liters of gear oil. Additional Information. Gonna put on my new mag-hytec rear diff cover on next wk. IF you have a factory limited slip or any clutch style limited slip a limited slip additive will need to be added. The label on the bottle says Limited Slip on the top corner of the label. 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. Redline makes a non-limited slip gear oil … Red Line Gear Oils already contain this additive (except the NS). My vehicle has a limited slip differential. There was much chattering of the limited slip clutches when the truck mad a turn, and it … In any case, some good quality API GL-5 gear lube will be fine for limited slip differentials including "Positraction". The Lucas did not perform well in my trucks differential. If you have a limited slip diff, you do need to add the motorcraft friction modifier - otherwise it will fry the clutches. Gear-Oil Additive: 21518: 50 g Tube plastic: F: Additional Information . Lucas is another "climbing" lubricant. ----- 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. Does that mean I don't need to add the limited slip additive? We do not recommend synthetic fluids. I am changing the diff fluid in my ford nine inch rear end. Going to use Mobil 1 75W-90 LS. It is also very quiet now. This was their response ...what do you think? I've been using it for many years without any problems. I kept getting "one wheel peel". ECGS recommends Dino (Non-Synthetic) 85w140 Lucas oil with a Ford or Dana limited slip additive for clutch style posi's. If limited-slip differential chatter occurs, add AMSOIL Slip-Lock™ Friction Modifier Additive. 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. BTW, it's a very good gear lube. Does this mean no additive is necessary? 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 … Used Mobil 1 that says limited slip friction modifier included but the Power Lock in my Dana 70 is chattering. 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).