3.4-liter 5VZ drivetrains (MC31)

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1995-2004 3.4L Tacoma
1995-2002 3.4L 4Runner

NEW: Updated Red Anodized "MC3X" Design!! Stronger plate design with improved seal adapter for better sealing performance!

This is the World's First Gear Drive T/Case Adapter Kit for 3.4-liter 5VZ-FE equipped Tacoma, 4Runner, and T100 trucks with R150F 5-speed or A340F 4-speed automatic transmissions!

Using our high quality USA-Made USA-Billet Aluminum, this adapter kit allows you to bolt a Toyota RF1A Gear Drive Transfer case behind your 5-speed manual or 4-speed automatic transmission. This opens the door for you to use our strong Total-Spline™ 2.28:1 TacoBox™ or Total-Spline™ 4.70:1 TacoBox Supreme™ Dual Case Products in your truck. This takes you to a Crawl Ratio of 79:1 with stock diff gears or as low as 210:1 with 5.29:1 diff gears. In the Automatic world this translates to a Crawl Ratio of two to four times slower than the typical Marlin Crawler equipped 5-speed setup.

This is seriously no joke! If you really want to Crawl, then go with the inventor and originator of Tacoma, FJ Cruiser, and 4Runner Rock Crawling, Marlin Crawler!

We have designed our kit for use with a 23-spline gear drive transfer case input, such as our Total-Spline™ input for the strongest 2005+ setup on the market, period.

Top-shift style transfer case or Crawl Box required. Includes our MarGasket, our Heavy Duty EcoSeal™ transmission output seal, and high quality OEM JIS Japanese mounting hardware.

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 www.p65warnings.ca.gov.

Marlin Crawler Dual Case Explained

Watch as BigMike explains how our Dual Transfer Case System works
at the 2017 FJ Summit in Ouray, Colorado (conversation begins at the 50-second mark)

How our TacoBox improves your truck's off-road capability

Short TacoBox Demonstration at Outer Limits

Automatic TacoBox Demonstration in 3rd Gear (91:1)

Rock Crawling Throttle Finesse with an Automatic

Using a Starter to verify Dual Case Load Reduction

Walking The Crawler up "The Wall" @ 580:1

Climbing "The Wall" at Poughkeepsie Gulch
with No Throttle in a 2016 Toyota Tacoma

Downhill with NO driver in a 2016 Toyota Tacoma

Dual Case Engine Compression Braking Demonstration

580:1 Triple Case TacoBox Demonstration