Automatics[edit | edit source]The 42RLE is a 4-speed overdrive automatic transmission. The 42RLE comes in 2003.5+ Jeep Liberty. The 45RFE is a 4-speed overdrive automatic transmission, with an alternative 2nd gear ratio for downshifting. The 45RFE was replaced in mid-April 2003 by the 42RLE in the 2003.5+ Liberty. The 545RFE is a 5-speed overdrive automatic transmission. The 545RFE was the only transmission available in Liberty CRD (diesel engine) models. The Liberty's maximum tow rating with an automatic transmission is Class III 5,000#. Mechanically, the 42RLE has 13 bolts and a straight crossmember, while the 45RFE and 545RFE have 15 bolts and a backwards angled crossmember . Electronically, vehicles equipped with the 42RLE have a 4 connector NGC PCM (Powertrain Control Module) with an integrated TCM (Transmission Control Module), while those equipped with the 45RFE have a 3 connector JTEC PCM and a separate TCM. Show
Gear Ratio Table
Manuals[edit | edit source]The NSG370 is a 6-speed overdrive manual transmission. The NSG370 comes in 2005+ Jeep Libertys. The NV3500 is a 5-speed overdrive manual transmission. The NV3500 was replaced by the NSG370 in 2005+ Libertys. The NV1500 is 5-speed overdrive manual transmission with an unsynchronized first gear. The Liberty's maximum tow rating with a manual transmission is Class II 3,500#. The clutch design of the manuals results in a lower tow rating than that of the automatics. A driver skilled in towing with manuals may be able to safely tow more than Class II. Gear Ratio Table
Cooling[edit | edit source]Jeep Libertys with the 42RLE transmission have an auxiliary transmission cooler in front of the engine radiator. Libertys with the 45RFE transmission have the transmission cooler coils integrated into the engine radiator. Liberty CRDs with the 545RFE have a combination transmission cooler & A/C condenser in front of the intercooler and engine radiator. Libertys with the NSG370, NV1500, and NV3500 manual transmissions don't have a cooler because manual transmissions lack a fluid pump.
Off-Roading[edit | edit source]An automatic transmission is more popular than a manual for off-roading. It removes the distraction, water leakage, and clutch wear associated with off-road manual shifting. These benefits come at a price, as an automatic is always heavier than an equivalent manual. External Links[edit | edit source]
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What happens when a transmission control module fails?Some of the most common signs of transmission control module failure include trouble shifting gears, getting stuck in gear, and lower gas mileage. But there are so many other red flags to look out for. Any signs of a bad transmission control module warrant a trip to your local mechanic.
Do you have to reprogram transmission control module?Transmission Control Modules are made by various companies but are essentially the same. If you have an aftermarket controller/module, it will have to be reprogrammed every time you replace the factory one. It also ensures that you replace worn-out parts with new ones.
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2005 jeep liberty transmission control module
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