Early Bronco AX15 5-Speed Manual Transmission

Early Bronco AX15 Transmission Swap Guide

The Aisin-Warner AX15 is a highly regarded medium-duty 5-speed manual transmission, introduced in 1988 and widely considered one of the best factory 5-speeds available. Its strength, smooth shifting, and overdrive capability make it an excellent choice for an Early Bronco AX15 transmission conversion.

Why Choose the AX15?

The AX15 is a strong, fully synchronized transmission with helically cut gears for smooth operation in all driving conditions. It’s well-suited for both street use and off-road applications, offering a good balance of strength and drivability.

Key Features

• Split-case design with top-shift configuration

• Rear-mounted shifter location for clean installation in Early Broncos

• Fully synchronized in all gears for smooth shifting

• Helical-cut gears for reduced noise and improved durability

• Overdrive (0.79:1) for lower highway RPM

Gear Ratios

• 1st: 3.83

• 2nd: 2.33

• 3rd: 1.44

• 4th: 1.00

• 5th: 0.79

Fitment for 66-77 Ford Bronco

The AX15 can be cleanly adapted to a Ford Windsor V8 bellhousing using the “butterfly” bolt pattern with the proper adapter. Wild Horses kits include the necessary components to simplify installation and ensure proper fitment in 1966-77 Ford Bronco applications.

For Bronco owners looking for a reliable 5-speed with overdrive, the AX15 stands out as a well-rounded option that delivers smooth performance both on the road and on the trail.