Pure Drivetrain Ford 10R80 Transmission Flexplate
A stock stamped flexplate is fine for a daily-driven F-150 or Mustang, but it becomes the weak link once a 10R80 is sitting behind a supercharged Coyote, a tuned EcoBoost, or a drag-launched car that sees repeated hard hits from a transbrake or two-step. When the factory plate cracks around the crank bolts or the welded ring gear starts to let go, you hear it first: a metallic knock at idle, a clank on engagement, or a starter that grinds and skips. The Pure Drivetrain Solutions 21-F10-1000 is a one-piece billet replacement built for that situation, so the part between the crankshaft and the torque converter stops being the thing you worry about.
The flexplate bolts to the rear of the crankshaft and carries the torque converter, so every bit of engine torque headed into the 10R80 passes through it. It also carries the ring gear the starter engages. Because the 10R80 locks its converter clutch early and often to make the most of ten ratios, the plate sees engine pulses and torque reversals almost all the time instead of having them softened by a slipping converter. A plate that flexes, cracks, or runs out of true shows up as vibration and noise long before it fails outright.
Pure Drivetrain machines this plate from aerospace-grade alloy steel to a .002 in. total indicated runout, then puts it through a three-stage heat treatment and its own stress-proofing process. The ring gear is integral, with 141 teeth cut into the same piece of steel, so there is no welded or pressed-on gear to separate. That 141-tooth count matches the factory 10R80 plate Ford Performance sells for the 5.0L Coyote, so the factory starter engages it the same way. The plate has lightening pockets, a matte black finish, and is spin-tested to 20,000 RPM, which the manufacturer states exceeds the SFI 29.2 test standard.
Do not assume every bang in a 10R80 is the flexplate. Harsh or delayed engagement and harsh shifts on this transmission are far more often a hydraulic or adaptive problem, and Ford has issued several bulletins for exactly that. Read our 10R80 common problems and fixes guide first, and if you drive a Mustang see the 10R80 Mustang problems rundown. A flexplate noise stays the same in every gear and changes with engine speed. A shift problem changes with the gear. With the engine off, look through the bellhousing inspection opening, rotate the engine by hand, and check every bolt hole for cracks and every ring gear tooth for chips. Shine a light on the bolt bosses; cracks often show as rust lines on a used plate.
This plate is listed for the Ford 10R80, the ten-speed used in the F-150, Mustang, Expedition, Navigator and Ranger. The manufacturer machines it for multiple torque converter bolt patterns but does not publish a vehicle-by-vehicle list, and it states that fitment must be confirmed before ordering. Engine and crank flange vary across the 10R80 lineup, so do not assume a plate for a 5.0L Coyote is correct for an EcoBoost. The Ford Performance factory plate, for example, is specified for the Coyote 5.0L with the 10R80 and is not for the earlier 6R80. Send us your year, engine and VIN, plus your converter brand if it is aftermarket, and we will confirm before it ships. Browse the rest of our 10R80 parts collection for matching hardware.
If you are chasing harsh shifts rather than noise, start with our 10R80 F150 shift problems guide instead; a flexplate will not fix a hydraulic fault.
| Brand | Pure Drivetrain Solutions |
| Part number | 21-F10-1000 |
| Fits | Pure Drivetrain Ford 10R80 Transmission Flexplate |
| Type | Flexplates |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Do not assume it. The plate is listed for the Ford 10R80 and machined for multiple converter bolt patterns, but the manufacturer requires fitment to be confirmed before ordering. Send us your year, engine and VIN and we will check it before it ships.
It has a 141-tooth integral ring gear, the same tooth count as Ford's factory 10R80 flexplate for the 5.0L Coyote, so the factory starter engages it the same way.
The manufacturer states it is spin-tested to 20,000 RPM, which exceeds the SFI 29.2 test standard. If your track requires a specific certification label, confirm that with us before you order.
Ford specifies torque-to-yield flexplate bolts on the 10R80 Coyote. Stretched TTY bolts should not be reused, so plan on new crank bolts.
Usually not. Harsh engagement and harsh shifts on the 10R80 are most often hydraulic or adaptive problems covered by Ford service bulletins. Replace the flexplate for cracks, ring gear damage, runout or high-power reliability.
Mercon ULV. Set the level hot and do not overfill; on the 10R80 about a quart too much can cause overheating and fluid out of the vent.
