Transmission & Drivetrain

Transplanting a 5.9L Cummins engine and Allison 1000 six-speed automatic transmission into an ’01 Ford F-250.

When we added power to our 2009 GMC Duramax Diesel, we wanted to ensure the longevity of our transmission and differential by making sure they run cool enough.

There are several aftermarket clutch options to choose from for these trucks, but only a couple offer a substantial upgrade from stock without the cost, noise, driveability, and pedal effort considerations of a full-blown competition clutch.

Eight-lug trucks are built tough to perform under extreme situations and, in most circumstances, they offer many years of reliable use.

In this report, we focus our attention on Ford’s first completely electronic, light-truck automatic, the E4OD: a spin off of the hydraulically managed, three-speed C6.