![]() ![]() To be clear, the following are the 545RFE gear ratios: The top 0.67:1 was probably chosen since that was the largest one that could easily fit without enlarging the transmission, making it too big for the organization’s automobiles. These are relatively close to each other due to the available size. Even the factory where the transmission was made was also brand-new.Īccording to experts, the 545RFE comes with 2 overdrive gears. When the 545RFE transmission was launched, it had the broadest range of gear ratios within its class. The reverse was designed to be equal to first gear to accommodate heavy loads easily. The 545RFE transmission had a tall 3.00:1 first gear for initial acceleration. The engineering of the 545RFE transmission closely resembles that of the solid Torquefiles or an up-to-date version. Now, the 545RFE transmission had six forward speeds and one reserved for kickdowns. It could also be found in several Dodge Durango models within this period.Īlthough the engine yield was 200 rpm less than the 45RFE, the outcome was a considerable decrease in noise and fuel consumption. The 545RFE transmission found its way to several SUV and truck applications from 2001 to 2012 with Jeep Commander and Jeep Grand Cherokee models that sport higher output Hemi engines. The new transmission had a standard axle ratio that resulted in 2000 revolutions per minute at the engine, allowing you to cruise at 110 km/h (70 miles per hour). ‘RFE’ refers to the ‘rear-wheel-drive application and full electronic controls.’īut by 2001, the 545RFE transmission was produced due to a taller, extra overdrive ratio and programming changes. ![]() The ’45’ refers to its torque rating, i.e., ‘5,’ while ‘4’ represents the number of forward gears. This transmission was paired remarkably well with the 4.7 L PowerTech V8 engine. 545RFE Transmission: Specsīut back in 1998, Chrysler has introduced the 45RFE in the 1999 WJ Jeep Grand Cherokee. The 545RFE transmission, based primarily on the 45RFE automatic, was used extensively in Chrysler’s entire fleet of rear-wheel heavy-duty trucks, except for coupes and sedans. A dual internal filter system (one filter for the fluid cooler return system and the other primary filter for transmission sump).The 545RFE transmission, formerly known as the 45RFE – introduced and popularly seen in the Jeep Grand Cherokee of 1999 – is highly notable for its three planetary gearsets instead of 2 planetary gearsets commonly used in a 4-speed automatic. The transmission was a perfect fit for 2-wheel-drive vehicles as well as all-wheel-drive automobiles. The automobile universe witnessed the introduction of the 545RFE/45RFE transmission in 1999 Chrysler models. Read below for specs and more information. This kit will only work on OE solenoids with the proper resistance value of 2.5-5.0 ohms.The 545RFE transmission is an electronically controlled unit that was great for its time until it was replaced bu the 65RFE and 66RFE. The repair kit contains enough parts to rebuild six solenoids. This TransGo governor pressure solenoid repair kit contains everything you need to take apart the original equipment solenoids, restore the valve bore, then replace the spool valve, spring and cap with new ones. ![]() When the solenoid sticks or is restricted, the computer notices that the pressure reading from the sensor does not match the desired governor pressure and sets a code which puts the unit in limp-in mode resulting in 3rd gear start and no shift. Simultaneously, it monitors the feedback from the governor pressure sensor to confirm that the governor pressure is doing what it is commanded to do. ![]() The computer varies the duty cycle to the PWM governor pressure solenoid to achieve the desired output pressure. The computer uses the governor pressure solenoid to generate governor pressure relative to road speed, emulating what the hydraulic governor did in older ‘RH’ series transmissions. This results in complaints of wrong gear starts as well as governor solenoid and sensor performance codes. 1995 to 2007 Dodge, Ram and Jeep vehicles with the 40RE, 42RE, 44RE, 46RE, 47RE and 48RE automatic transmission often come in with contaminated governor pressure solenoids. ![]()
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