Motive Gear F8.8-410A Differential Ring & Pinion 4.10 Ratio Ford 8.8" Rear, 10-Bolt, 30-Spline, 8620 Steel, Compatible for Ford F-150, Mustang, Explorer, Ranger, Lincoln Town, Mercury Grand Marquis

Great quality

When together with no problems

pretty sure these are bottom of the barrel motive or knock off.I have in installed hundreds of motive gears and these come in a plain box , with part # not stamped in . instructions are photo copied. never could rid of the whine . stay away and save the aggrivation.installed motive gears from motive , in an actual motive box , set up perfect with no whine, also part number was stamped in gear

Fit and works as it should.

I’ve set up many rear ends in my day with a high degree of accuracy, I installed this set with a complete bearing kit and have had a strong whine since day one. Opened it back up twice to check wear pattern and backlash and I’m spot on but still the whine. Decided to put some miles on them and see if the would shut up but just the opposite.So 75 miles in I’m buying another set of gears. I do not recommend.

Quality is very good, installation was easy. The only complaint is gear whine. Not happy with that. Wear pattern is spot on with backlash @ .011. Will run it for a while to see if it "breaks in"

This piece wasn't new I spend 300 to put it and now I have to paid to take it out.. Insane ..

Bought these and the garage couldn’t not get the whine to stop, new bearings shims etc. Installed Ford Performance gears and were perfect on first install and super quiet. Will be refunding these Chinese made gears. (A- line stands for Chinese manufacturing). The non a- lines are american made.