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Home >> Ford >> 2024 >> Edge ST >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case >> Power Transfer Unit - 2.7L ECOBOOST (238KW/324PS) >> Description And Operation >> Power Transfer Unit >> Power Transfer Unit

Power Transfer Unit

GFD814250Courtesy of FORD MOTOR COMPANY

The Power Transfer Unit (PTU) is a gearbox that attaches to the transmission. The PTU directs power from the transmission differential case through a dog clutch to a hypoid ring gear. A hypoid pinion gear is meshed to the ring gear and splined to the output flange. A dog clutch is used to transfer drive torque from the input shaft to the ring gear. When the dog clutch is released, no torque is transferred through the ring gear and pinion to the rear driveshaft. When the dog clutch is engaged, normal AWD function is achieved by directing torque to the rear wheels as needed to prevent or control wheel slip and improve handling

There are two different models of the PTU. The low torque PTU is paired with the 8F35, 8F40, and MMT6 transmissions. The high torque PTU is paired with the 8F57 transmission. The low torque and high torque PTUs are similar in design and operation.

Power Transfer Unit (PTU) External Components 

GFD814251Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 7034 Vent tube. Unique routing for each powertrain.
2 W719766 PTU to transmission bolt for 8F35/40 and MMT6. One-time use.
2 W719765 PTU to transmission bolt for 8F57. One-time use.
3 W500210 Heat shield bolt
4 7F469 Heat shield
5 -- PTU to engine bracket bolts. Unique parts for each powertrain.
6 7B664 PTU to engine bracket. Unique parts for each powertrain.
7 7B696 Oil temperature sensor harness bracket (If equipped).
8 W500210 Oil temperature sensor harness bracket bolt

Power Transfer Unit (PTU) Intermediate Shaft 

GFD814252Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 4B422 Halfshaft circlip. One-time use. Part of 4C198 kit.
2 4C199 Halfshaft to intermediate shaft D-Ring. One-time use. Use 4C197 (assembly aid plastic part) to assemble this 4C199. Both parts are in 4C198 kit.
3 W719767 Intermediate shaft bolt. One-time use.
4 3B470 Intermediate shaft bearing to PTU O-ring. One-time use.
5 3K183 Intermediate shaft. Unique designs for MMT6 and 8F57. Same design for 8F35 and 8F40
6 -- Intermediate shaft seal. Serviced with intermediate shaft.

Power Transfer Unit (PTU) Cooling Systems - If Equipped 

GFD814253Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 8W600 Fan and bracket assembly
2 W500213 Fan and bracket assembly bolt
GFD814254Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 W790462 Oil-to-Coolant cooler stud. One-time use, part of 7P159 kit.
2 7P146 Oil-to-Coolant cooler. Part of 7P159 kit.

Power Transfer Unit (PTU) Components 

GFD814255Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 6397 Hollow Dowels. 8F35/40 and MMT6 only. Part of 7H469 kit.
2 7L486 PTU Housing. LH carrier.
3 7A021 Output flange and deflector. Part of 7275 kit.
4 7G360 Motor actuator. Part of 7G360 kit.
5 W790474 Actuator Bolts. Part of 7P462 (O-ring Kit) and 7G360 (Actuator replacement kit) Kits.
6 7L486 PTU Cover. RH carrier.
7 12A648 Oil temperature sensor (If equipped).
8 W790475 PTU Housing to Cover bolts. Part of 7R284 kit.
9 4N282 Drain plug

Power Transfer Unit (PTU) Actuator Motor 

GFD814256Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 -- Actuator fork.
2 -- Motor Actuator.
3 -- Gear reduction
4 -- Dog clutch collar
5 -- Actuator cam

Power Transfer Unit (PTU) Internal Components 

GFD814257Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 4886 Connecting Sleeve. 8F35/40 and MMT6 only. Unique for Auto and Manual applications. Part of 7H469 kit.
2 7B652 PTU to transmission compression seal. One-time use. Dust seal for cavity between transmission and PTU. Part of 7H469 kit.
3 7A283 Input shaft seal - LH-Low Torque PTU's. One-time use. 8F35/40 and MMT6 only. Seals brown PTU fluid from leaking into cavity between transmission and PTU. Part of 7H469 kit.
3 7Z064 Input shaft seal - LH-High Torque PTU's. One-time use. 8F57 Only. Seals brown PTU fluid from leaking into cavity between transmission and PTU. Part of 7H469 kit.
4 -- Selective shim for bearing preload. Not serviced.
5 -- Ring gear shaft bearing - LH. Not serviced.
6 -- Ring gear shaft. Not serviced.
7 7P250 Cover O-ring. One-time use. Seals brown PTU fluid from leaking at the joint between the housing and cover. Part of 7R284 Kit.
8 -- Ring gear shaft bearing - RH. Not serviced.
9 -- Dog clutch collar. Not serviced.
10 -- Input shaft. Not serviced.
11 -- Input shaft bearing. Not serviced.
12 7H426 Input shaft seal - RH. One-time use. Seals brown PTU fluid from leaking between the PTU and RH halfshaft. Part of 7H469 kit.
13 -- Input shaft bearing snap rings. Not serviced.
14 -- Selective shim for bearing. Not serviced.
15 -- Collapsible spacer. Not serviced.
16 -- Output shaft nut. Not serviced.
17 4B422 Output flange circlip. One-time use. Part of 7275 kit.
18 7H426 PTU Rear seal. One-time use. Seals brown PTU fluid from leaking between the housing and output flange deflector. Part of 7H469 kit.
19 -- Output shaft bearing. Not serviced.
20 -- Output shaft bearing. Not serviced.
21 -- Selective shim for bearing. Not serviced.
22 -- Output shaft. Not serviced.

Rear Seal Kit 

GFD814258Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 7275 Companion flange kit
2 7H426 Seal. One-time use.
3 4B422 Circlip. One-time use.
4 -- Deflector. Part of 7A021.
5 7A021 Flange and deflector

RH Halfshaft Kit 

GFD814259Courtesy of FORD MOTOR COMPANY
Item Part Number Description
4C198 RH Halfshaft kit
2 4C197 Spline protector. Use to install Halfshaft to intermediate shaft D-Ring.
3 4B422 Circlip. One-time use.
4 4C199 Halfshaft to intermediate shaft D-Ring. One-time use.

Case Seal Kit 

GFD814260Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 7R284 Cover seal kit
2 W790475 PTU Housing to Cover bolts. One-time use.
3 7P250 Cover O-ring. One-time use. Seals brown PTU fluid from leaking at the joint between the housing and cover.

Actuator Seal Kit 

GFD814261Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 7P462 Actuator seal kit
2 7P461 Actuator to cover press in place gasket. One-time use. Seals brown PTU fluid from leaking at the joint between the actuator and cover.
3 W790474 Actuator bolts. One-time use. 4 required.

Input Shaft Seal Kit 

GFD814262Courtesy of FORD MOTOR COMPANY
Item Part Number Description
1 7H469 Input Shaft Seal Kit
2 7H426 RH Input shaft seal
3 7A283 LH Input shaft seal
4 7B652 PTU to transmission compression seal
5 7086 Connecting sleeve to input shaft O-ring seal
6 6397 Hollow dowels
7 4886 Connecting sleeve. 8F35/40 and MMT6 only. Unique for Auto and Manual applications
8 4B422 Connecting sleeve snap ring
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