Review on 🚗 Enhance Your Ford's Performance with Torco AFM0050JE Type F Limited-Slip Additive - 4oz by Todd Markel

This fixed a rear diff rattle on my 2004 Pontiac GTO when cornering at low speed. Remarkable fact about my GTO: It had 140,000 miles on it when I poured this and Torco RGO gear oil in the diff, after trying Mobil One and TransX synthetic oil for 5,000 miles with minimal (though noticeable) reduction in rattle. So even if you have a noise on an old (and generally original) GTO diff, how do I treat it?