Motive Gear F8.8-308, Differential Ring & Pinion, For Ford 8.8", Ratio 3.08, 10-Bolt, 30 Spline, 13 Pinion & 40 Ring Tooth -Fits Ford, Lincoln, Mercury, Mazda, Rep. Yukon 24349, Ford M-4209-F308.

Always quiet fits perfect only gear I use for years motive gear

Great gears for a ford 8.8. Be aware that in order to install the center pin into the carrier you will have to grind one of the teeth on the gear. Otherwise you will be unable to assemble the carrier. This is true no matter what brand of gears you install in your 8.8. If you have c-clip eliminators this will not be necessary, you can assemble the carrier on the bench and install the axles afterwards.

After having the Motive Gears professionally installed, the whining noise is almost unbearable. I've had the setup of the gears rechecked by different shops and both techs agree that the gears are set up correctly and the noise issue is the actual ring and pinion. No warranty and can't return them.

No noise big diffrences on power

These gears set up fine and gave me a good pattern, but don't look for any help from the manufacturer. All I wanted was confirmation on the country of origin, but they refused to respond to me. Thankfully I wasn't looking for technical help from them. Amazon lists the country of origin as USA, but I seriously doubt it. These are likely Korean (best case) or Chinese (worst case) made gears, but I couldn't get any confirmations. Regardless I decided to run and install them, and they are quiet, thankfully.