WIT WHATEVER IT TAKES TRANSMISSION PARTS, INC Ford Genuine Ford Fluid XL-3 Friction Modifier Additive - 4 oz. Twin Pack

used on my 2005 F150 4.6Ldiff used to slip on take off. One bottle of this and in about three days of driving in normal traffic it stopped the little thump on take off in first gear. I will purchase it again. 217k plus changed the rear diff oil 3 times now.

Product costs 2x as much at dealership

My 2010 Taurus Limited recently developed a transmission shudder and I read that this product can help ease if not fix the problem. It worked perfectly and hopefully it will remain that way. I do a drain and fill on my transmission every 30k miles or so and for now on i will add a bottle with the fluid change just for the extra peace of mind

easy thick blends well to do the job

Excelente producto

Added 6 ounces to the Sterling differential with Motorcraft 75w140 on an earlier fluid change. No problems. No noise.

Works better than you could imagine. Nothing else comes close

Worked great and great price.