8F35 Master Rebuild Kit 2019-2023

Ford's 2.0L EcoBoost crossovers from 2019 on - the Edge and Lincoln Nautilus first, then the Escape, Corsair, Bronco Sport and Maverick - put the 8F35 eight-speed behind that engine. Once those vehicles pass high mileage, the complaints we hear are slipping when hot, a bang into gear, flare on upshifts and clutch codes that come back after every clear. This 8F35 master rebuild kit for 2019-2023 is the soft-parts box for that overhaul, cross-referenced to Ford JM5Z-7A098-A and aftermarket 174002EP / D174004EP.

What the master rebuild kit does in an 8F35

The 8F35 is a clutch-to-clutch transaxle: every one of its eight ratios comes from applying a pair of clutches around the planetary sets, and the valve body solenoids time each handoff. There is no band or roller clutch to cover for a weak pack, so a glazed friction or a leaking sealing ring shows up directly as slip the computer tries to adapt away. The kit pictured carries the internal filter, the four valve body and separator plate gaskets, the pan gasket, friction and steel plate sets, the O-ring and sealing ring sets, the converter and axle seals, a pump gasket and the small rubber check plugs. With those renewed, every circuit in the case is sealed again and every pack gets fresh friction material at the same time.

Symptoms that call for a full 8F35 overhaul

• Slipping or engine flare that gets worse as the fluid heats up
• Harsh engagement into Drive or Reverse, or a clunk on the 1-2 shift
• Several ratio and clutch codes stored together - Ford's bulletin 22-2281 lists P0730, P0751, P0752, P0756, P0757, P0771, P0727, P0741, P1744, P2700, P2701 and P2704
• Dark fluid with friction material, or steel glitter on the pan magnet
• Leaks from the converter seal or axle seals on a high-mileage unit

How to confirm the 8F35 really needs a rebuild

Pull the pan before you order anything. Fine, non-metallic debris with a single P0766 or an intermittent no-reverse points at a blocked separator plate orifice, which Ford fixes by cleaning the plate. A low-speed shudder on an early Edge or Nautilus is often a software reflash. A loaded magnet plus a cluster of clutch codes is different: on units built on or before December 20, 2021, Ford traced that pattern to failed output planet carrier needle bearings, and that debris travels through every clutch, valve and the cooler. Our 8F35 problems and TSB guide walks through which bulletin matches which symptom and build date.

Fitment

This kit is listed for the 8F35 in 2019-2023 2.0L EcoBoost applications: Edge and Nautilus from 2019, Escape and Corsair from 2020, Bronco Sport from 2021 and Maverick from 2022. The same model years also offered the 8F24 and 8F40, which have different valve body castings and solenoid layouts, so the vehicle alone does not prove which unit you have. Read the transmission tag, compare the new gaskets to your old ones at teardown, or send us your year and VIN and we will check it. Every part we carry for this unit is in the 8F35 transmission parts collection.

Install notes

• Record the 13-digit solenoid strategy number from the case before removal; you need it to program the unit after the rebuild.
• If your build date falls inside the 22-2281 window, inspect the output carrier pinions for play and replace the carrier rather than reusing it. We stock an 8F35 planetary and the 8F35 sun shell.
• Soak the frictions in Mercon ULV, build each pack with the new steels and check clearance against Ford's specification.
• The pump is chain driven and nothing holds the drive gear and chain in position during assembly. If the chain slips off when the converter housing goes on, you get a no-pressure, no-move unit on the first start. A 307-769 bench mount fixture keeps the case steady while you work.
• Back-flush the cooler and lines after any failure that left metal in the pan, then fill with Motorcraft Mercon ULV only.
• After installation, program the solenoid strategy and run the adaptive relearn; expect firm shifts for the first few drive cycles.

Which vehicles does this 2019-2023 8F35 kit fit?

It is listed for 8F35-equipped 2.0L EcoBoost models: 2019-2023 Edge and Nautilus, 2020-2023 Escape and Corsair, 2021-2023 Bronco Sport and 2022-2023 Maverick. Some of those vehicles also came with an 8F24 or 8F40, so confirm the tag or send us your VIN.

What part number does it replace?

The listing cross-references Ford JM5Z-7A098-A and aftermarket numbers 174002EP and D174004EP.

Does the kit include a filter and steel plates?

Yes. The kit shown includes the internal filter, friction and steel plate sets, valve body and pan gaskets, seals and O-rings. Hard parts such as the planetary carrier, pump and drums are not included.

Will a rebuild fix P0766 or no reverse?

Often that complaint does not need a rebuild. Ford bulletin 19-2386 traces P0766 and intermittent no reverse to a contaminated separator plate orifice that is cleaned in place. Rebuild when the pan shows friction or metal debris and several clutch codes are stored.

What fluid does the 8F35 take after the rebuild?

Motorcraft Mercon ULV. Do not substitute Mercon LV or a multi-vehicle fluid.

Is programming needed after installing the kit?

Yes. Program the transmission solenoid strategy from the 13-digit number on the case and run the adaptive relearn with a capable scan tool. Shifts can feel firm for several days while it relearns.

• Ford 8F35 Transmission Problems: What the Four Ford Bulletins Actually Say