FordRacing M420988410 8.8" 4.10 Ring and Pinion

These just fit and were quick and easy to set up with a “crush sleeve eliminator.”Plus ford gears are face hobbed and to me that’s so much simpler to set up the pattern. Just one ‘extra’ of the thinnest shims and the backlash was right in the ‘tight’ side of the specs with a nearly perfect (better than ‘acceptable’) mesh pattern. I was almost dissapointed LOLI used USA Standard Gear bearings (koyo) to rebuild the diff, national wheel bearings and seals.I highly recommend the ‘crush sleeve eliminator’ - that lends a level of confidence you don’t always feel with crush sleeves. Even the best wind up with do-overs sometimes but with the solid spacer and shims it’s no harm no foul.

Used these 4.10s on my 2008 Lincoln Town Car. Took a .024 pinion shim. I was able to get the pattern on the first try. Now my Lincoln has more torque and better acceleration like it should. Remember, the Town Car is a big heavy car and requires gears like these 4.10s that I installed. Just had to buy a Hypertech Tuner to reprogram my speedometer, other than that, the gears are quiet and powerful.

If you run a Ford rear end you need to run a Ford gear. Does as it should. It’s quiet and it makes that mustang feel a little more like a muscle car

Fit like it was made to. Used with about a 30 thousands pinion shim and an adjustable crush pack. Made a very nice run pattern on the gear teeth without much fuss. Runs quite. Right price.

Nice product. Installed with no issues didn't have to make any adjustments for back lash or pinion depth. Would recommend. Shipped and arrived on time.Installed in a 2006 Ranger 4x4

Cant tell a difference in acceleration from 3.33 to these. Now also have a whine at 65mph +. Installed by ford dealership.

Fit like a glove in my Ford 8.8 rear end. Definitely hear a small whine but installation was a breeze. Also I did go from a 3.27 to a 4.10. Definitely take note of your shims, and follow a 500 mile break in period. It will make a world of difference. I used 2qts of 75-140NS Red Line, and added the small bottle of Ford Friction Modifier.

Changes the car into an entirely different animal Nice quiet operation and correct OEM fit. (Note: Computer software tuning if required on newer computer controlled vehicles)

Get from red light to red light waaaaaaaaayyyyyyy faster now..........

Didn’t seem authentic even had rust in places