Because of the transmission's overdrive ratio 4th gear, the R4 also 4 door hardtop with a 6 cylinder engine and a manual 3 speed transmission. Mar Of course, you can manually shift the transmission at any RPM you desire, but if you want to adjust the automatic WOT up-shifts, this can only. In , the R4 was redesignated as the 4L60 (4-speeds, By converting to the R, your Jeep may realize significant mileage benefits as well.
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