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Ford Super Duty 4R100 Transmission - The Wood Way

Transmission Side
Robin Stover | Writer
Posted October 1, 2007

Rebuilding the Super Duty 4R100 for severe use

When it comes to heavy hauling, most people would agree that the Ford Super Duty platform is probably the most favored of the bunch. Since its inception, annual sales have been staggering at over 200,000 per year. This equates to well over a million Super Duty trucks in service today. The bulk of these were equipped with the 7.3L Power Stroke diesel option, and the great majority of these came with the time-tested four-speed automatic known as the E40D or 4R100. This transmission was suitable for stock power levels (and end users who do things by the book), however, once overloaded or exposed to increased torque loads, both the E40D and 4R100 quickly showed signs of weakness.

That's why we did a little investigative work to see how these transmissions could be configured to perform reliably under even the most demanding conditions. Our search led us to John Wood Automotive of Holtville, California. Wood started building Ford transmissions in 1983 and prides himself with a reputation for utmost attention to detail and customer satisfaction. Wood operates his business on the principle of quality before quantity, which with only one assistant requires he take on only one transmission rebuild per day. This methodology pays off, as most of Wood's patrons are referred by word of mouth. Diesel drag racing, sled pulling, sand-dune running, and heavy towing are the primary lifestyles of Wood's customers.

Wood has an intensive educational rebuild program that's set up to teach Super Duty owners all the ins and outs of their transmission in one full eight-hour work day. Some customers take notes while others take a rain check and visit the nearby Glamis OHV area, but everybody leaves happy knowing they have the most efficient, reliable, and robust E40D or 4R100 money can buy.


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John Wood Automotive
Holtville, CA 92250
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