extracted from:
http://en.wikipedia.org/wiki/Chrysler_45RFE_transmission  on 11 November 2008
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45RFE and 545RFE

The 45RFE was introduced in the Jeep Grand Cherokee in 1999, it is notable for including 3 planetary gearsets rather than the two normally used in a 4-speed automatic. It also features 3 multiple disc input clutches, 3 multiple disc holding clutches, and a dual internal filter system (one primary filter for transmission sump, one for the fluid cooler return system). In the 45RFE applications four gears are utilized, with a different (1.50:1 rather than 1.67:1) second gear to increase versatility when downshifting. In 545RFE usage, an extra taller overdrive ratio is also used. Chrysler decided to refer to it as a "multi-speed automatic".

The 45RFE is produced at the Indiana Transmission plant in Kokomo, Indiana. It is normally paired with the 4.7 L PowerTech V8.

The 45RFE later became the 5-speed 545RFE. 45RFE transmissions can have their programming changed to enable the 5th forward gear.

    * Gear Ratios:
          o 1st 3.00:1
          o 2nd 1.67:1
          o 2nd Prime 1.50:1
          o 3rd 1.00:1
          o 4th 0.75:1
          o Reverse 3.00:1
    * 545RFE only:
          o 5th 0.67:1

Applications:

    * 45RFE
          o 1999.2000 Jeep Grand Cherokee (4.7L)
          o 2000-2002 Dodge Dakota (4.7L)
          o 2000-2002 Dodge Durango (4.7L)
          o 2002 Dodge Ram 1500 (3.7L and 4.7L)
    * 545RFE
          o 2001. Jeep Grand Cherokee (4.7L, 4.7L H.O., 5.7L Hemi)
          o 2002-2007 Jeep Liberty (2002-early 2003 3.7L, and all diesel applications)
          o 2003. Dodge Ram (3.7L, 4.7L, 5.7L Hemi)
          o 2003. Dodge Dakota (4.7L, 4.7L H.O.)
          o 2003- Dodge Durango (4.7L, 5.7L)
          o 2006- Jeep Commander (4.7L, 5.7L Hemi)