Fixing highway RPMs with a Gear Vendors C6 4x4 unit

If you're tired of your engine screaming at 70 mph, installing a gear vendors c6 4x4 overdrive is probably the best thing you can do for your old Ford truck. Anyone who has spent time behind the wheel of a classic F-series or a Bronco knows exactly what I'm talking about. The C6 transmission is a legend for a reason—it's basically a bulletproof block of iron that can handle all the torque you throw at it—but it has one massive flaw by modern standards. It only has three gears. ...

March 6, 2026 · 7 min · Persis Francesca