Some 2016 – 2019 model year 4Runner 4WD vehicles may exhibit a cyclical groaning or grinding noise from the front differential in 2WD that is not present during 4WD operation. Follow the Repair Procedure in bulletin T-SB-0012-19 to address this condition. The repair is to R & R Front Differential and the new part number is 41110-35A92. This repair is covered under the Toyota Powertrain Warranty. This warranty is in effect for 60 months or 60,000 miles, whichever occurs first, from the vehicle’s in-service date.