Input and output speed sensors, governor pressure transducer, 4WD filter, spin-on filter and pan gasket for Ram and Jeep 68RFE, 545RFE and 45RFE automatics.
A Ram, Durango, Dakota, Grand Cherokee, Liberty, Commander, Wrangler or Aspen with an RFE automatic that drops into limp mode, sets speed sensor or gear ratio codes, or is simply due for its filter service is the truck this kit was put together for. In one box you get an input speed sensor, an output speed sensor, a third pressure sensor, a 4WD primary filter, the spin-on cooler return filter and a pan gasket. The listed reference numbers are 5179267AC (05179267AC), 4799662 (04799662) and 128944. It is listed for the 45RFE, 545RFE, 65RFE, 66RFE and 68RFE.
The controller works out which gear the transmission is in from two magnetic pickups. Chrysler's diagnostic text says the input speed sensor reads 60 teeth on the input clutch hub and the output speed sensor reads 30 teeth on the park gear. Divide one by the other and you get the actual ratio, which the controller compares with the gear it commanded. If they disagree it sets P0731 through P0736, and an erratic signal sets P0715 or P0720. Line pressure is closed-loop: the line pressure sensor reports actual pressure and the controller adjusts the pressure control solenoid to match its target. The primary filter protects the pump inlet, and the spin-on filter cleans fluid returning from the cooler before it feeds lube.
Scan for codes and watch input rpm, output rpm and line pressure (desired and actual) live. The input and output sensors are simple two-wire pickups, so a resistance check and a look at the connector and harness will tell you a lot, as shown in our input and output speed sensor guide. If actual line pressure will not follow desired, read the pressure control solenoid and line pressure guide before blaming the sensor. Real slipping you can feel, or burnt fluid, points inside the case and this kit will not fix it.
Listed fitment: Ram 1500 2002-2018, Ram 2500/3500 2002-2016, Dakota 2000-2011, Durango 1999-2018, Grand Cherokee 1999-2013, Liberty 2002-2007, Commander 2006-2010, Wrangler 2006-2018 and Chrysler Aspen 2007-2009. Two honest cautions. The primary filter in this kit is the 4WD version, and 2WD units use a different primary filter. And the listing calls the third sensor a governor pressure sensor or transducer. RFE transmissions have no governor; the matching part on these cases is the line pressure sensor, so compare its connector and mounting with yours. Also check the pan gasket against your pan shape, or send us your year and VIN. More parts for these units are on the 45RFE parts page and the 68RFE parts page.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
4WD. Chrysler uses different primary filters for 2WD and 4WD units, so a 2WD truck needs the 2WD filter even though the sensors and spin-on filter are shared.
No. RFE units control line pressure electronically and use a line pressure sensor on the case. Compare the third sensor's connector and mounting with the one on your transmission before installing.
A failed input or output sensor typically sets P0715 or P0720, and a bad signal can also set P0731-P0736 ratio codes. Check wiring and connectors first; a damaged harness sets the same codes.
No, they bolt into the outside of the case. The pan only comes off for the primary filter, which is why doing both together saves a second job.
ATF+4. Chrysler lists a pan service fill of about 5.2 liters (4x2) or 6.2 liters (4x4) on the 45RFE/545RFE; set the final level hot on the dipstick.
Clear the codes and road test. If the shifts were harsh or soft before the repair, run a Quick Learn with a scan tool so the controller relearns clutch fill.
