Dec 142011

UNITRAX has been a proud Gear Vendors Under/Overdrive™ dealer for over 27 years. As a matter of fact, Gear Vendors, was the first new distributorship we acquired as UNITRAX. We recognized very early on that the Gear Vendors gear-splitting overdrive was simply “Best of Breed.”


The Under/Overdrive™ is available for most 2WD and 4WD GM, Chrysler, and Ford vehicles. The overdrive can also be installed in many restoration, hot rods, muscle cars, classic cars and trucks. The gear-splitting and overdrive benefits allow you to retain up to twice the power from one gear to the next for improved performance when climbing grades or towing heavy loads. When running on flats, at the push of a button, you can lower your RPM by 22%. If you have an overdrive now, you can run in double overdrive!

The key features of the Under/Overdrive™ are:

• .78:1 Overdrive with a 22% engine RPM reduction. Reduced engine noise for a quieter ride.
• 30,000 GCVW. Tested at 4500 Ft. Lbs of Torque. For applications up to 1500HP.
• Planetary design for long life and quiet operation. Hydraulically operated & electronically shifted.
• AUTODRIVE™ for full throttle shifts with automatic transmissions.


Speak with UNITRAX to see how the Gear Vendors Under/Overdrive™ can provide you with the right gearing.

UNITRAX can be reached at or 800.622.4327