Marlin Crawler 21-spline 4.70:1 XD Gear Kit

We’ve brought our Xtreme Duty 4.70:1 Total-Spline gears back!!!! 

• New lower price for 21-spline applications!
• Check out this in-depth XD Features article!

Our XD Gears now feature a Total-Spline input oil pump that maintains constant
oiling for the Pocket Bearing and Dual Case Coupler! (depending on application)
Another industry first from the original 4.70:1 inventor, Marlin Crawler!

As the inventor of the 4.70:1 Gear Ratio for use in Toyota transfer case products with 24-years experience with custom low range gear set manufacturing, our 4.70:1 XD gear set is packed with far more features than any other and is in a league all by itself. Take your truck to an unmatched new level of off-road confidence, performance, and reliability today!

The Marlin Crawler 4.70:1 XD gear kit will replace your truck’s stock 2.28:1 low range ratio with our 4.70:1 ratio, giving you a 106% lower final drive ratio for manual applications, or when combined with a torque converter, an equivalent low range ratio of 9.4 to 11.75:1 based on ATF temperature for automatic applications. For a typical application with stock 4.11:1 ring and pinions, our low range gear set will take the stock 37:1 final drive to a new 76:1 final drive providing 2.1 times more control, 2.1 times more torque, 2.1 times less bouncing, and 2.1 times less drivetrain load.

Your truck will become easier to control, have a much greater ability to maintain traction, and will save critical components such as your clutch (if manual transmission) and your brakes (if automatic transmission). Additionally, your torque output will increase by more than double, which means you won’t have to rev your engine to get power. You’ll be able to go slower, control your vehicle, prevent bouncing and jerking, which will result in a safer trail ride with less risk of breaking parts.

Each Gear Kit includes the following:

• Total-Spline XD Input Gear, XD Countershaft Gear, and XD Low Speed Gear
• Japanese-made  OEM Input and Countershaft bearings, preinstalled
  • Note: You must transfer all four of your original front snap rings during installation
• Complete Gasket Seal Kit ($49 value), including…
  • Oil pump seal
  • Speedometer sender o-ring
  • EcoSeal HD transmission output seal ($12.99 value)
  • EcoSeal HD transfer case output seal ($9.99 value)
• Marlin Crawler Delrin Turtle Shift Knob ($15 value)

It has always been Marlin’s philosophy that if you’ve got your t/case removed then you should also replace your transmission output seal while it is readily accessible, and for this reason we have always included a new transmission output seal since 1996!

Application: Any 1979-95 gear drive 4-cylinder transfer case. Please see our line of conversion adapter plates for V6 and V8 gear drive and chain drive applications which are required to run our 4.70:1 gears in automatic applications.

Upgrading your stock transfer case is not a difficult task and can be done with ordinary hand tools. Please see our Online Installation Instructions for more info.