Baumann Engineering - Introduction to A4LD, 4R44E, 4R55E and 5R55E Transmissions

A4LD, 4R44E, 4R55E and 5R55E Transmissions "The Little E4OD"

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For the same information presented here on our new website go to http://www.becontrols.com/tech/ch7a4ldinfo.htm You will also find links to much more technical information.

These four and five-speed transmissions are used in four cylinder and V-6 applications (primarily the Ranger and Explorer) and have evolved as outlined in the "Alphabet Soup" chapter. The A4LD was derived from the C-3 three-speed automatic transmission by placing a two-speed overdrive unit in front of the original three-speed workings. As the names imply, the "E" transmissions are electronically controlled (similar to the AOD-E/4R70W transmissions), while the 5R55E is a five speed version currently used only with the SOHC 4.0L engine. The 4R44E is a light duty version of the electronic unit, similar to the old non-4.0L A4LD transmission.

Baumann Engineering can recalibrate valve bodies for 2.3L, 2.8L, 2.9L, 3.0L and 4.0L applications on an exchange basis. This service will address clutch and band durability issues, as well as shift quality and shift points. For serious performance use, though, we recommend that you upgrade your vehicle to the heavy-duty 4.0L Ranger/Explorer version of these transmissions if it is not already equipped. Of course, the same transmission oil cooler and torque converter strategy used with the E4OD transmission applies here also. Baumann Engineering will produce a Baumannator TCS version for these transmissions (useful for retrofit applications, as well as a means of tuning OEM equipped vehicles).

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