Stock Hemi LX’s usually do 180-200 hp at the wheels (same engine components), but they have a better exhaust, which helps. The swap will bolt right in, identically. The difference is also in the solenoid pack and the unit control module ( TCM). The 45RE and 545RE’s are the exact same transmission, except the 545RE’s have the 5th gear “electronically activated”. They are different when it comes to software. The 45RFE and 545RFE are identical mechanically. What is the difference between 45rfe and 545rfe? But even though Chrysler’s expertise in its engineering features is way good, they still have their periodic financial crises which became their distinction. The entity also purchased the Dodge Brothers automobile company with the aims of having a full range of brands like those of the General Motors. In 1928, Chrysler launched the De Soto brand for the low-medium end level category and the Plymouth brand for the low-end level category. The name refers to its Rear-wheel drive design and Full Electronic control system.Ĭompeting in its class, Chrysler vehicles are one of the well-loved vehicles in the market for all its outstanding features and those durable Chrysler parts included in its well-inspected specifications.Ĭhrysler is a corporation based in the United States that manufactures elegant automobiles they were in this market long enough to handle technological advancements and innovations to their benefit. The RFE is an automatic transmission family from Chrysler. The converter plus transmission holds approximately 16 quarts. You will also need approximately 8 quarts of ATF 4+ as 545 transmission fluid. I recommend not replacing the round seal, if not properly sealed, it will cause the transmission to burn up. This kit comes with a gasket and a round seal as well. The advanced auto 4wd part number is FK-319. The advanced auto 2wd part number is FK-330. The main sump filter is different for 2wd and 4wd. Both filters are accessed after the trans pan is dropped. There are 2 filters in this unit, the main sump filter, and a cooler return line filter (looks like an oil filter). The 4.7L and the 5.7L HEMI use the same transmission, so it should also be the same filter part numbers for both engines. For more information, you should look at the Jeep section of Consumer Reports or similar to see if what the reliability rating is for the Hemi and tranny.Īs for the 545 services, the same tranny casing is used on the 45RFE, 5-45RFE, and 68RFE, so this procedure is the same for these transmissions as well, but check part numbers and fluid capacities. The biggest difference between the RE and the RFE is that the later does not have support for driver interactive shifting ( sport shifting mode).Īs for reliability, the RFE is generally considered above average, but a number of people have had problems after installing an aftermarket computer programmer. Like the RE, the RFE comes out of the Jeep parts bin and has been used in Jeeps since at least 2004. In fact, the 545RE would have been the first widely available production 6-speed auto, except the engineers used the 6th gear as an extra overdrive gear. The 545RFE is based on the 545RE tranny which has been around since 1999. The torque converter and the planetary gear sets are the two main components of an automatic unit. Inside the unit is the planetary gear sets, which are responsible for providing different gear ratios. The bell housing is the place where the tranny connects to the motor. To get a better understanding of how an AT unit works, the best place to start is the bell housing, which contains a torque converter as opposed to a clutch found in manual vehicles. Planetary gearsets in the unit create different gear ratios, allowing the car to shift between different gears based on the communication from the torque converter.The torque-converter connects your motor to the unit and puts pressure on AT fluid to communicate speed.The bell housing contains a torque-converter, which replaces the clutch used in a manual system vehicle The engine connects to the unit at the bell housing.
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