RAM 1500 Truck 4WD V8-4.7L (2008)
Shifter A/T: Description and Operation
545RFE Automatic Transmission
Description
DESCRIPTION
The gear shift mechanism provides six shift positions which are:
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Park (P)
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Reverse (R)
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Neutral (N)
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Drive (D)
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Manual second (2)
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Manual low (1)
Operation
OPERATION
MANUAL LOW (1) range provides first gear only. Maximum engine braking is also provided in this range. MANUAL SECOND (2) range provides
first and second gear only.
DRIVE range provides FIRST, SECOND, THIRD, OVERDRIVE FOURTH, and OVERDRIVE FIFTH gear ranges. The shift into OVERDRIVE
FOURTH and FIFTH gear ranges occurs only after the transmission has completed the shift into D THIRD gear range. No further movement of the shift
mechanism is required to complete the 3-4 or 4-5 shifts.
The FOURTH and FIFTH gear upshifts occur automatically unless the Tow/Haul or OD Off mode is enabled. No upshift to FOURTH or FIFTH gears
will occur if any of the following are true:
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The transmission fluid temperature is below 10° C (50° F) or above 121° C (250° F).
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The shift to THIRD is not yet complete.
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Vehicle speed is too low for the 3-4 or 4-5 shifts to occur.
Upshifts into FOURTH or FIFTH will be delayed when the transmission fluid temperature is below 4.5° C (40° F) or above 115.5° C (240° F).
