10R80 Overhaul Kit 2017-2020

This is not a plain gasket and seal set. It is a 31-piece genuine Ford parts bundle for the 10R80 10-speed that combines the three hard parts and soft parts most often replaced when an early unit develops harsh engagement, harsh 3-4 and 4-5 shifts, or a bang into reverse: a new CDF clutch cylinder (hub), a new clutch and planetary container cylinder (the reaction shell), the overhaul seal kit, and a full set of A through F clutch friction plates. It is listed for 2017-2020 10R80 applications, but the CDF cylinder part number in the box is the one Ford specifies for the 5.0L Mustang, so read the fitment section before you order.

What this kit replaces in a 10R80

The 10R80 builds ten forward ratios from four planetary gear sets, one mechanical one-way clutch and six friction clutches, lettered A through F, each applied by its own linear force solenoid in a two-piece valve body. The C, D and F clutches are fed through the CDF cylinder. Ford found that the sleeve in that cylinder can move axially and open a leak path between circuits, which shows up as harsh or delayed engagements and shifts with ratio and solenoid codes. The F clutch also has a second known weakness: its friction plates can brinell (dig) into the clutch and planetary container cylinder, leaving a ridged surface that makes the F clutch grab. Replacing the cylinder, the container and the frictions together removes both causes in one teardown.

What comes in the box, by Ford part number:

• JL3Z-7H351-B CDF clutch cylinder
• PC3Z-7B177-A clutch and planetary container cylinder (reaction shell)
• HL3Z-7153-F overhaul seal kit
• Friction plates: A clutch x3, B x5, C x5, D x6, E x5, F x4

Symptoms that point to this repair

• Harsh or delayed engagement into Drive or Reverse, often worse on a cold start
• Harsh 3-4 or 4-5 upshifts and harsh 5-3 or 4-3 downshifts
• Check engine light with shift solenoid or ratio codes such as P0751, P0756, P0731 through P0736 or P0729
• Gray silt or clutch material in the pan and filter at a fluid service

How to confirm before buying

Rule out the software side first. Ford TSB 23-2152 lists the same harsh engagement and shift complaint on 2017-2020 F-150 and 2018-2021 Mustang and starts with a valve body overhaul and an adaptive learning drive cycle, not a teardown. The dealer CDF test in TSB 24-2254 uses a pressure transducer on the line pressure port to prove whether the CDF circuit is leaking; if it fails, the cylinder must come out. Our 10R80 Mustang shift problems guide walks through the codes, and the 10R80 common problems and fixes guide covers each TSB and what it replaces. If a scan shows a single solenoid circuit fault with clean fluid, a 10R80 solenoid kit may be all you need.

Fitment

Listed for the 10R80 from 2017 through 2020, new, with a 1-year warranty. The listing also names 2017-2020 F-150 and 2018-2021 Expedition and Navigator, but Ford's own parts table in TSB 24-2254 assigns JL3Z-7H351-B to the 5.0L Mustang (plus Transit and 3.0L Explorer), while F-150, Expedition and Navigator call for ML3Z-7H351-B and different C and D frictions. In practice this kit matches a 2018-2020 Mustang GT 5.0L. For any other vehicle, send us your year and VIN before ordering and we will check the cylinder number against your build. Browse every part for this unit on the 10R80 collection page.

Install notes

• The kit does not list steel plates. Ford replaces the F clutch steels along with the container, so inspect every steel for heat marks and plan to replace any that are blued or ridged.
• Soak all new frictions in MERCON ULV before assembly and lube sealing rings with assembly gel so they do not roll on install.
• Clean or replace the cooler and fit a new filter and pan gasket; a 10R80 pan kit with filter and gasket covers that.
• If the valve body was reworked or replaced, a genuine 10R80 valve body goes in with new solenoid retainers.
• Fill with MERCON ULV and set the level hot, at the temperature in the service procedure. Sonnax reports that a single quart of overfill makes the 10-speed vent and run hot.
• Clear keep alive memory and complete the adaptive learning drive cycle so the module relearns fill times for the new clutches.

Will this kit fit my F-150 or Expedition?

Possibly not as a drop-in. The CDF cylinder in this kit is JL3Z-7H351-B, which Ford lists for the 5.0L Mustang, Transit and 3.0L Explorer. Ford calls for ML3Z-7H351-B on F-150, Expedition and Navigator. Send your year and VIN and we will confirm before you order.

Is this just a seal kit?

No. It is a 31-piece bundle: the CDF clutch cylinder, the clutch and planetary container cylinder (reaction shell), the overhaul seal kit and A through F friction plates. It does not include steels, a filter or fluid.

Why replace the reaction shell at the same time?

Ford traced harsh 3-4, 4-5 and reverse shifts that are worse when cold to the F clutch frictions brinelling into the container cylinder. A ridged container will damage new frictions, so Ford replaces the container, F frictions and F steels together.

What fluid does the 10R80 take after the rebuild?

Motorcraft MERCON ULV only. Check the level hot at the temperature in the service procedure, because overfilling by about a quart causes venting and overheating.

Do I need a relearn after installing it?

Yes. Clear keep alive memory and run the adaptive learning drive cycle. The module times each shift from how fast each clutch fills, and new frictions and a new CDF cylinder change those fill times.

• 10R80 Mustang Shift Problems: Diagnosis and Fix
• 10R80 Mustang Common Problems and Fixes
• 10R80 Common Problems and Fixes
• 10R80 Pressure Control (EPC) Solenoid Symptoms