Total Spline Input Gear

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Marlin Crawler Total Spline Input GearMarlin Crawler Total Spline Input Design
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NEW for 2019: We are now offering our famous Total-Spline Turbo Input gear in our Ultimate Strength Competition Grade material!! The strongest 23-spline input gear JUST GOT EVEN STRONGER!!

Marlin Crawler's Exclusive Total Spline 23-spline 2.28:1 transfer case input gear, the strongest 23-spline input gear in the world, period. This will convert a 21-spline 1979-1995 4-cylinder transfer case to a 23-spline version so that the stronger 5spd R150F (3.0L V6) and R151F (2.4L Turbo I4) transmissions may be used. Fits any gear driven t/case originally fitted to 4cyl 1979-1995 trucks and 4Runners, and used in all our 1979-2021+ Dual Case and TacoBox setups. Factory 2.28:1 Gear Ratio.

This is the strongest 2.28:1 input gear in the world.

Total-Splineā„¢ Technology

Heat Treated Chromoly Steel

Full-length Spline Engagement

Addresses one of the weakest parts of your t/case

Minimizes Dual Case Coupler wear, combats strip-outs

We challenge you to find a stronger input gear!

Build your transfer case right the first time, and put your tools away!

Proposition 65 Warning for California Consumers

WARNING: Products we sell can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to