When your 2017 Ford Explorer's transmission produces a grinding noise during shifts or while driving, it signals potential internal damage that requires diagnosis. The Explorer uses either the 6F50 or 6F55 six-speed automatic depending on engine configuration, and both can develop issues that produce grinding sounds.
Explorer Transmission Overview
The 2017 Explorer with the 2.3L EcoBoost or 3.5L V6 uses the 6F50 transmission, while all-wheel drive models with the 3.5L TT EcoBoost use the 6F55. These transmissions are similar in design, using three planetary gear sets, four clutches, and a torque converter. Both transmissions feature adaptive shift programming that learns driving habits.
Types of Grinding Sounds
Grinding during shifts suggests clutch pack or band wear—components that synchronize gear changes are damaged. Constant grinding proportional to vehicle speed points to planetary gear or output shaft bearing issues. Grinding only in certain gears narrows the problem to specific gear train components. Grinding during engagement into drive or reverse indicates torque converter or input shaft problems.
Common Causes
Contaminated or degraded transmission fluid can cause gear grinding as clutches slip and components lack proper lubrication. Internal bushing wear allows gear misalignment that creates grinding. Planetary gear damage from shock loads or towing beyond capacity damages gear teeth. Torque converter turbine damage creates grinding that sounds internal but originates in the converter.
Diagnostic Approach
Check transmission fluid level and condition first—low fluid causes numerous issues. Dark, burnt-smelling fluid indicates internal damage has already occurred. Scan for DTCs that might indicate which gear or clutch circuit is affected. A stall test can reveal torque converter issues. If internal damage is suspected, a pan drop allows inspection for metal debris indicating specific component failure.
Repair Options
Fluid flush may resolve minor issues from degraded fluid—$200-$300. If debris is found, transmission rebuild becomes necessary at $3,000-$4,500 depending on damage extent. Torque converter replacement (if that's the source) costs $1,200-$1,800 including labor. Complete transmission replacement with a remanufactured unit runs $3,500-$5,000. Given the cost of repair, getting an accurate diagnosis before committing to major work is essential.