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The Ultradrive is an automatic transmission manufactured by Chrysler beginning in the 1989 model year.. Initially produced in a single four-speed variant paired with the Mitsubishi (6G72) 3.0-liter engine in vehicles with transverse engines, application was expanded to the Chrysler 3.3- and 3.8-liter V6 engines in 1990 model year Dodge Caravan/Grand Caravan, Plymouth Voyager/Grand Voyager ...
The M platform was the final production passenger car with a solid rear axle mounted on Hotchkiss-style, parallel semi-elliptical leaf springs sold in the U.S. [1] The M-cars were built at St. Louis, Missouri , and Newark, Delaware , with initial debut (LeBaron/Diplomat series) in spring 1977 as 1977 1/2 models, [ 2 ] with production shifting ...
The M600 was offered with the Rockwell F-130-NX rear axle, with a 4.88:1 gear ratio. By 1979, Chrysler Corporation no longer sold incomplete chassis and ended production of the M series. The M series was available with three engines during its production: The 318 polysphere Chrysler A engine , the 413 cid, and the 440 cid Chrysler RB engine .
In the 45RFE applications four gears are utilized. In the 545RFE four gears are used on the upshift and a new "gear", 2nd Prime, was used with a different (1.50:1 rather than 1.67:1) ratio to increase versatility when downshifting. Although, with some tuning, you can get the 545RFE to upshift into 2nd Prime. [2]
An optional four-wheel drive system called Freedom Drive II is based on Freedom Drive I and operates similarly, however in combination with a unique CVT transmission it is capable of a 19:1 gear reduction simulating a low range usually found in vehicles with dedicated transfer cases. This 19:1 "crawl" ratio is achieved with a much lower ...
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Previously, an automatic 3-2 downshift occurred only if the driver pushed the accelerator to the floor. This change was made to maintain acceptable in-town performance with taller final-drive ratios in the rear axle — 2.76:1 rear axle gears were being furnished in applications previously equipped with 2.93:1 or 3.23:1 gearsets.
The engine was especially suited for transverse applications in Chrysler's minivans, but was also used in a longitudinal front-wheel-drive setup on 1993-1997 LH platform cars. It was last used in 2010 for Chrysler minivans before the introduction of the new 3.6 L Pentastar engine for the 2011 model year.