Ford Racing M420988373 8.8" 3.73 Ring and Pinion

Very quiet gear, easy set up 3.73I had an expensive Motive gear set in my custom built 8.8 and I couldn't get it to run quiet no matter what. Set it up perfectly new bearings, shim kit, crush sleeve eliminatorSlow multiple short heat cycles changed fluid 2xChecked pattern and lash it was spot on.The Motive gear was just bad noise on excel and decel.So I went with the FORD Performance gear set and WOW what a difference! I used the same bearings so I know it wasn't a bearing causing an issue..The car is a dream to drive again with zero rear end noise.Ford gear in a Ford housing who would've thought...

I've set up many gears in the past 40 years, but Ford Racing Gears are by far the easiest to set up and quietest gear sets made. Highly recommend this seller. Great product and service.

2011 F150

Easy set up and big performance gain

Installed in the rear of a 2006 Mercury Grand Marquis. Just like the rumors said, the tolerances are so close to the factory parts that I didn't even need to change the shims - the backlash was perfect. Always verify though. Set includes a crush sleeve and a nut.

Received it in less than a week came as pictured. Happy customer 👍

Wow what can I say works great

Upgraded from factory 3.27's to these 3.73's and had a shop install them. The gears are a little noisy at certain highway speeds, but not too terrible. Difference in acceleration was noticeable, but not terribly dramatic; going to 4.10's would have been more impressive, but would've killed my fuel economy and made 1st gear useless. Bear in mind that newer Mustangs using electronic speedometers, rather than the old gear-and-cable type speedos, are going to require either a speedometer recalibrator tool or a programmer tool that lets you reflash the ECM to account for gear changes or different tire sizes. (I went with the latter option.)Also, whether you're doing these yourself or having a shop install them, it's a good time to also have your differential rebuilt and your rear end bearings replaced, since it'll all be torn apart to put these in, anyhow. So, factor those parts into the cost of your upgrade, as well as gear fluid and friction modifier additive.