A whine that climbs with your speed on the freeway. A clunk when you drop it into drive. Both are classic signs of a differential that’s wearing out. If you’re shopping for used Toyota differentials for sale, the ratio matters more than anything else. A 3.73 and a 4.10 can look identical sitting on a pallet, but put mismatched front and rear gears in a 4x4 and the driveline binds the first time you engage 4WD. We pull the correct ratio from your VIN, for Tacoma, Tundra, 4Runner and other Toyota trucks.