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17-21 Ford F250 + 350 4WD SRW Nitro Gear Package Kit Rear (4.88 RATIO)

Fits: 2017-2021 Ford F250 + 350 4WD SRW (10.5" Rear)

Recommended: 7 quarts of Nitro Synthetic Plus Gear Lube

Gear Package Kit Includes:

  • Nitro front ring & pinion
  • Nitro front Master Install Kit
  • Nitro rear ring & pinion
  • Nitro rear Master Install Kit

ARB Package Notes:

  • 4.56 & up takes RD166
  • 4.10 & down takes RD167

Finally, an option for re-gearing 2017 & Newer Ford Super Duty, Exclusively at Nitro!

Suffering from poor performance and reduced fuel economy resulting from oversized tires?

A Nitro gear change will help get that performance and economy back!

If you've fitted larger tires to your vehicle then you are likely experiencing a loss in performance, fuel economy, and more constant transmission gear "hunting" - This is because the larger tires reduce your engine's RPMs below the optimal power band. Re-gearing the differentials in your vehicle is the only way to get your vehicle back into its optimal operating RPM range, thus improving performance and reducing strain on your vehicle's drivetrain. This is especially important for today's vehicles as they feature tall factory gearing and overdrive transmissions which are less tolerant to increase in tire size or the weight of added accessories.

It's a common misconception that gear changes are reserved only to hardcore off-roaders or trucks with huge tires. However, re-gearing is one of the single most beneficial modifications you can make to keep the performance, economy, and durability of your daily-driven 4x4. This is a mod for anyone with larger tires, increased weight, or for increased performance on stock vehicles for towing or increased acceleration.


*Nitro Exclusive!

Nitro Rings & Pinions:

8620 Steel Gear Forgings

Precision Machining

CNC Triple-lapping

Heat Treatment

Rockwell Hardness Tested

Nitro Master Install Kits:



Front Differential: Dana 60 Rev.

Rear Differential: Ford 10.5" 37 spline pinion

Gear Ratio: 4.30 or 4.88

Manufacturer: Nitro Gear & Axle


2017+ Ford F250 & F350 Superduty 4x4 Single Rear Wheel w/ 6.7L Powerstroke Scorpion Diesel, Boss 6.2 Or Triton V10 Gas Engine

Nitro Gear & Axle: GPSD17-4.88-105

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