Gear Vendors has been displaying their bolt-on overdrive units at the SEMA show since 1981, and Rick Johnson brings us up to speed on the latest from Gear Vendors. They have units that fit just about every application imaginable, and they handle over 1000 horsepower with ease. Add to that the 28% increase in fuel economy (or higher!) and you have a great mod for your muscle car or tow vehicle. We tested one in project Splitter and were really impressed with the performance.