45RFE/545RFE

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The 45RFE is an automatic transmission from DaimlerChrysler. The name refers to its Rear wheel drive|Rear wheel drive design and Full Electronic control system.

Introduced in the WJ Grand Cherokee in 1999, it is notable for including 3 planetary gear sets rather than the two normally used in a 4-speed automatic. This gives it six theoretical speeds, and it would have been the first six-speed transmission ever produced in volume, but it is programmed to only use five of these ratios. Four are used for upshifts, with a different (1.50:1 rather than 1.67:1) second gear for downshifts. Although five of the six ratios are used, Chrysler decided to call it a "4-speed automatic".

The 45RFE is produced at the Indiana Transmission plant in Kokomo, Indiana. It is normally paired with the 4.7L V-8.

The 45RFE later became the 5-speed 545RFE.

• Gear Ratios:
  • 1st 3.00:1
  • 2nd (Upshift) 1.67:1
  • 2nd (Kick-down) 1.50:1
  • 3rd 1.00:1
  • 4th 0.75:1
  • Reverse 3.00:1
• 545RFE only:
  • 5th 0.67:1

Applications:

• 45RFE
  • 1999–2000 WJ Grand Cherokee
  • 2002–2003 KJ Liberty
• 545RFE
  • 2001–2004 WJ Grand Cherokee
  • 2005-2006 KJ Liberty CRD
  • 2006-2007 XK Commander
  • 2005-2007 WK Grand Cherokee