45RFE¶ The 45RFE is a 4 speed automatic overdrive transmission. Usage¶ The 45RFE 4 speed automatic transmission is used in the 1999 Jeep Grand Cherokee with the 4.7L engine. Transmission 1st 2nd 3rd 4th 5th Rev 45RFE 3.00 NA 1.00 NA 3.00