Cummins to Ford 7.3 / 6.9 Diesel Automatic and Manual Transmissions
Posted by Diesel Conversion on Oct 15th 2020
There is a split between the 6.9L and 7.3L diesel engines in the late 1980's. Using model years as a guide is usually a good way to judge which transmission you have however model year can not always be relied upon.
6.9L Diesel Transmissions
T-19 4speed Manual- We do not offer any parts or support for using this transmission in a conversion.
C-6 Automatic- We do not offer any parts or support for using this transmission in a conversion.
7.3L IDI and Power Stroke Diesel Transmissions
ZF5 5 speed Manual- The ZF5 was introduced in 1987. It is rated for 420 ft.lb of torque. 95 and newer transmissions are rated for 470 ft/lbs of torque.This is one of the most popular and sought after transmissions for conversions in the 80-90's model Ford conversion. In addition to being better equipped to handle the power of the Cummins engine than it's predecessor this transmission also has an overdrive gear allowing faster top speeds and lower cruising RPM's to help maximize fuel economy.
E4OD 4 speed Automatic- The E4OD is close to it's predecessor in power ratings and specs however the E4OD has an electronically controlled overdrive unit. Some people have used early E40D’s that were behind a non-powerstroke engine without an aftermarket transmission controller, however, we do not recommend it. If you do, don't expect the transmission to shift in the optimum torque range of the Cummins- since the Cummins makes it's best power and torque at a much lower rpm than the 7.3. It also is required for you to make a bracket to mount your original Ford throttle position sensor to the Cummins throttle lever. We do not currently provide such a bracket. We currently offer 2 different aftermarket control modules that work well for this conversion. Please see the conversion overview for more information.
Starter/Adapter Plate Options:
Our adapter plates require the use of a Ford 6.0 or 6.4 Diesel Starter.
Go to our catalog to order Adapter Plate Kits, or our kit builder to order Conversion Kits