45RFE Transmission Master Rebuild Kit Dodge Jeep Ram

A Durango, Dakota, Ram 1500 or Jeep with the 4.7L and the 45RFE automatic tends to tell you it needs a rebuild in a few familiar ways: a harsh or slow engagement when you pull it into gear, slipping when you lean on it with a load behind you, or a burnt-clutch smell after years of towing. When the diagnosis points inside the case, this master kit puts the friction plates, steel plates, gaskets, lip seals and O-rings for the whole unit into one box. It replaces OE reference numbers B128820A, W128880A and W128881A under manufacturer part number ING-RP01901.

What this rebuild kit renews inside a 45RFE

Chrysler built the 45RFE around clutch-to-clutch shifting. There are no bands to adjust; instead the solenoid pack and valve body route line pressure to the underdrive, overdrive, reverse, 2C, 4C and low/reverse clutches in turn, while a line pressure sensor and the pressure control solenoid keep pressure where the controller wants it. As the frictions glaze, fill times stretch and the computer compensates, until it cannot. The frictions in this kit are cut for a smooth apply and the steels are ground flat, so each pack builds clearance evenly instead of chattering or flaring. The new gaskets, lip seals and O-rings close the internal leaks that rob apply pressure from tired drums and pistons.

Symptoms that call for a 45RFE overhaul

• Harsh or delayed engagement into drive or reverse that does not improve after a fluid change
• Slipping under load, worst on a hill or with a trailer
• Flare or neutral feel on the 3-4 shift as the overdrive pack wears
• Limp mode with friction material and dark fluid in the pan
• A burnt-clutch smell from the dipstick tube

Rule out the control side first

On an RFE, a pressure problem can feel exactly like worn clutches. Chrysler sets P0868 for line pressure low and P0869 for line pressure high when the sensor reading and the commanded pressure disagree, and a worn solenoid switch valve bore is a well documented cause of lost drive after a shift into reverse. Scan for codes, compare desired and actual line pressure, and look at the pan contents before you pull the unit. Our 45RFE pressure control solenoid and line pressure guide covers the testing, and the 45RFE valve body testing guide explains how to check the switch valve and accumulators. If the codes are clean and the magnet is coated in lining, the clutches are your problem and this kit is the fix.

Fitment

The listing fits the Chrysler 45RFE in Dodge Durango, Dakota, Ram 1500 and Jeep applications. The 45RFE first appeared in 1999 as a four-speed and was later reprogrammed into the five-speed 545RFE on the same hardware, and Chrysler made valve body and solenoid changes across the run, so plate counts and some seals can vary between years. Match the OE reference numbers above to your unit, check the ID tag on the side of the case, and compare the plates you pull out against the kit before assembly. If you are not sure, send us your year and VIN and we will check it. Every 45RFE part we stock is on our 45RFE parts page.

Install notes

• This is a bench rebuild. The transmission comes out, gets fully disassembled, and every clutch pack is restacked and clearance-checked to your year's spec.
• Pre-soak the frictions in ATF+4 and lube the seals on assembly. Inspect each drum for cracks and spline wear; a worn 45RFE clutch drum should be replaced while it is apart.
• The kit does not include a filter. Install a new filter with the rebuild and refill with ATF+4 only.
• If the unit had pressure codes or a reverse engagement problem, service the controls at the same time. A new 45RFE solenoid kit or a rebuilt 45RFE valve body keeps a fresh clutch job from burning up again.
• After install, verify line pressure with a gauge at the case port, then reset adaptives and run the quick learn with a scan tool before the road test.

Does this kit fit the 4.7L Dakota?

Yes, the listing covers the 45RFE in the Dakota along with the Durango, Ram 1500 and Jeep. Match the OE reference numbers B128820A, W128880A or W128881A and the case tag, or send us your year and VIN to confirm.

Can a bad solenoid pack feel like worn clutches?

Yes. Low line pressure, a sticking solenoid switch valve or a failing pressure control solenoid can cause slipping, flares and limp mode on clean clutches. Check codes such as P0868 and P0869 and look at the pan before deciding on a rebuild.

What else should I replace with this master kit?

A new filter and fresh ATF+4 at minimum. Replace any cracked or worn drum, and if the unit had pressure or shift codes, service the solenoid pack or valve body at the same time.

Is a relearn needed after the rebuild?

Yes. Reset the transmission adaptives and run the quick learn so the controller learns the clutch fill times of the new frictions. Shifts can feel harsh or soft until that is done.

Can I install this kit without removing the transmission?

No. The frictions, steels and internal seals are only reachable with the transmission out of the vehicle and fully disassembled on a bench.

• 45RFE Pressure Control Solenoid Symptoms, Line Pressure Codes and Testing
• 45RFE / 545RFE Valve Body Problems: Symptoms, How to Test, and Replacement
• 45RFE Shift Solenoid Symptoms, Testing and Replacement
• 45RFE 3-4 Clutch Failure: Symptoms and Fix