Ultradrive

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Ultradrive
Manufacturer Chrysler Corporation
DaimlerChrysler
Also called 41TE/A604
41AE/A604
42LE/A606
42RLE
40TES
41TES
Production 1989-present
Predecessor A670
Class 4-speed automatic
Related PowerFlite

The Ultradrive is a 4-speed automatic transmission from Chrysler Corporation. It was produced from 1989 through the present and was commonly paired with the Chrysler 3.3 engine in transverse engined cars. The Ultradrive and its descendants are produced at Kokomo Transmission in Kokomo, Indiana.

Contents

The Ultradrive was a significant technological advancement in transmission operation, as it was one of the first electronically-controlled automatics. It pioneered many now-common features, such as adaptive shifting: the computer would optimize shifting based on the driving style of the operator. Unfortunately it earned a reputation for being unreliable, especially in Chrysler's minivans, which had high failure rates. A misprint in both owner's manuals and transmission fluid dipsticks in early models advocated the use of Dexron II transmission fluid in the event the required fluid (Type 7176, also known as ATF+3) was not available. Dexron does not provide the necessary fluid properties for proper operation of the transmission, often resulting in malfunction (commonly deferring the computer into the notorious "limp-home" mode, under which the transmission will not shift out of second gear) or complete failure of the unit. As a result, the older hydraulically-controlled 3-speed automatic was later made available on vehicles equipped with Mitsubishi's 6G72 V6 engine, which was usually paired with the Ultradrive during its first few years.

On paper, the A604 was a great innovation. When working correctly, it will shift smoothly and perfectly, thus providing a soft, comfortable ride often associated with high-end luxury cars. The transmission, being so electronic, also lacks bands to adjust.

The torque converter measured 9.5 inches in diameter and was mounted to the flywheel by a flexible drive plate. The transaxle was cooled through an oil-to-water heat exchanger in the collector tank on the radiator, and/or a standard oil-to-air heat exchanger.

The Ultradrive has evolved dramatically over its long years of production. Countless changes, both electrical and mechanical have been made in an attempt to improve the reliability of the A604. Such changes include different valve bodies, solenoid packs, sensors, etc. One of the better improvements was the introduction of a flash-programmable TCM, which monitors the operator's driving habits, and sets up a custom shifting pattern for the driver.

The A604/41TE transmission also uses 20 fewer parts than its 3-speed siblings.

Mitsubishi's Sportronic transmission was a modified version of the 41TE.

There are 4 different types of units. The differences between the types are the bell housing bolt pattern and valve body assemblies. The first type was used for the 2.5 L engine, second type for the 6G72 V6, third type for the 3.3 L and 3.8 L V6s and the fourth type for the 2.0 L and 2.4 L engines.

The most common problems with A604 transmissions are poor shifting quality and sudden locks into second gear ("limp-home" mode), even during highway driving. Nine design changes were made in an attempt to fix clutch failure, and four were directed to "shift busyness", or excessive shifting on hills.

After much pressure from the Center for Auto Safety, Consumer Reports and others, Chrysler promised to waive the $100 deductible in the warranty, provide loaners, and buy back any cars with Ultradrives that could not be fixed. Chrysler ran an unprecedented campaign to contact all owners of cars with Ultradrives to find and fix problems.

Applications:

The 41AE is a variant of the 41TE that was originally used for the all-wheel drive variants of the minivans, and is now used for the Chrysler Pacifica.

Applications:

The 42LE was an upgraded version of the 41TE modified for longitudinal engines. It debuted in 1993 on the LH cars. It is strengthened with a reworked final drive unit, barreled axle shafts, and upgraded clutch packs.

The 42LE was modified in 2003 as the 42RLE, originally for the then-new Jeep Liberty. This transmission will reportedly remain in production through the end of the decade with the LX cars and the 2007 Jeep Wrangler.

Applications:

The 40TES and 41TES are upgraded replacement versions of the 41TE, which were first introduced with the 2007 Chrysler Sebring. The 40TES is used with the 2.4 L GEMA I4 engine while the 41TES is used with the 2.7 L EER V6.

Applications:

The 62TE is a six-speed derivative of the 41TE first introduced with the 2007 Chrysler Sebring, and used on the 3.5 L EGJ V6. It is also used on Pacificas equipped with the 4.0 L V6.

Applications:

Retrieved from "http://en.wikipedia.org/wiki/Ultradrive#62TE"
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