9 / 132 ⾃动缩放

Menu Published
INTRODUCTION January 2017
MAIN MENU

DOMESTIC
AUDI/BMW/DODGE/JEEP
ZF8HP45/55/70/90
IMPORTS
The ZF8HP transmission will be found in Chrysler, Dodge and Jeep vehicles,
both two wheel drive and four wheel drive applications. The ZF8HP45 is typically
CHRYSLER
fitted behind 3.0L and 3.6L engines while the ZF8HP70 is powered by 5.7L or
6.4L engines. SRT 707-hp 6.2L Hellcat V8 engines will drive a ZF8HP90
AUDI transmission due to the increase in torque. Variants of this transmission will also
be found in Audi, Rolls-Royce, Bentley, Maserati and BMW 1, 3, 5 and 7 series
vehicles.
BMW

No part of any ATSG publication may be reproduced, stored in any retrieval system or
Search: transmitted in any form or by any means, including but not limited to electronic, mechanical,
photocopying, recording or otherwise, without written permission of Automatic Transmission
and Full Text
Service Group. This includes all text illustrations, tables and charts.
or Title Only
Start Search
Disclaimer: Manufacturer's procedures and specifications are provided in this manual. Torque
specifications provided for aluminum bolts are given for new aluminum bolts. At the time of
EXIT printing, a source for these aluminum bolts was not yet available. The same is so for end play
adjusting shims. Check with your local supplier or dealer for availability.
Updates are
available
click here to update The information and part numbers contained in this booklet have
been carefully compiled from industry sources known for their
reliability, but ATSG does not guarantee its accuracy.

Copyright © ATSG 2017

We thank Transtec and Worldwide for providing transmissions to ATSG making this manual possible

AUTOMATIC TRANSMISSION SERVICE GROUP

18635 SW107th AVENUE
CUTLER BAY, FLORIDA 33157
(305) 670-4161
www.atsg.com 1

AUDI/DODGE/JEEP
ZF8HP45/55/70

INDEX
Introduction................................................................................................................................... 3
Component Application Chart....................................................................................................... 4
Planetary Noise Diagnostic Chart................................................................................................. 5
Decoupling Operation................................................................................................................... 6
Typical Wire Diagram................................................................................................................... 8
Solenoid Information.................................................................................................................... 10
E-Shift Park Release Operation..................................................................................................... 18
ZF8HP55 External Disassembly.................................................................................................... 19
ZF8HP45 External Disassembly.................................................................................................... 29
Transmission Internal Disassembly............................................................................................... 34
A Brake Disassembly.................................................................................................................... 41
E Clutch Disassembly................................................................................................................... 45
C Clutch Disassembly.................................................................................................................... 46
D Clutch Disassembly................................................................................................................... 47
Valve Body Disassembly, ZF8HP45 and ZF8HP55 Information and Reassembly....................... 49
ZF8HP45 Park Hydraulic Schematic............................................................................................ 69
D Clutch Rebuild........................................................................................................................... 70
C Clutch Rebuild........................................................................................................................... 74
E Clutch Rebuild........................................................................................................................... 77
A and B Brake Rebuild.................................................................................................................. 80
Brake and Clutch Specifications and Adjustment Procedures...................................................... 86
Pump Assembly Rebuild............................................................................................................... 90
Transmission Internal Reassembly................................................................................................ 94
ZF8HP45 External Reassembly..................................................................................................... 99
ZF8HP45 Case Passage Identification.......................................................................................... 105
ZF8HP45 Fluid Specification........................................................................................................ 109
ZF8HP55 External Reassembly..................................................................................................... 110
ZF8HP55 Case Passage Identification.......................................................................................... 111
ZF8HP55 Fluid Specification........................................................................................................ 121
Special Service Tools..................................................................................................................... 122
Chrysler Corporation DTCs.......................................................................................................... 127

AUTOMATIC TRANSMISSION SERVICE GROUP

18635 SW 107th AVENUE
CUTLER BAY, FLORIDA 33157
(305) 670-4161
Copyright © ATSG 2017

Technical Service Information

MANUAL INTRODUCTION
ZF8HP55 ZF8HP45/70/90

This ZFHP55 was provided by This ZFHP45 was provided by

Worldwide Transmission Parts Corteco - Transtec
in Chicago Illinois Milan Ohio
ZF8HP Series Transmissions: 8HP45 / 8HP55 / 8HP70 / 8HP90 - (Variation 845RE / 870RE)

Applications: Audi Q5, Q7, A8 and A8L, BMW 1, 3, 5 and 7 series, Chrysler 300, Dodge Charger and
Durango, Ram 1500, Jeep G Cherokee, Range Rover, Rolls-Royce and Bentley.

The ZF8HP transmission uses four single planetary gear sets to produce 8 forward speeds and reverse.
These gear sets are connected to five clutch assemblies (shift elements). Two of which are multi-disc brake
type clutch assemblies and three which are driving type multi-disc clutch assemblies. Reducing drag,
these clutch assemblies are arranged in such a manner that three clutch assemblies need to be applied
(closed) while two remain released (open) for each gear.

The valve body and solenoids are joined together with the electronic transmission control (EGS) referred
to as the Mechatronic Assembly. All of which is designed to transfer more torque to the wheels while
simultaneously increasing efficiency.

Due to the notable differences in the construction of the ZF8HP45/70/90 transmission and the AWD
ZF8HP55 transmission, this manual will provide the disassembly, reassembly procedures for both. The
ZF8HP45 transmission from a Dodge Truck will be used dominantly throughout the manual of the
disassembly, inspection and rebuild of individual sub-components since all versions are quite similar. The
exception to this is the valve body. The ZF8HP55 is entirely different. Through collaboration with Sonnax
Industries, the differences between these two valve bodies are provided in this manual as well.

We thank Transtec for providing to ATSG the ZF8HP45 Transmission and we thank Worldwide
Transmission Parts in Chicago for providing the ZF8HP55 Transmission making this manual possible.
Copyright © 2017 ATSG
Figure 1
AUTOMATIC TRANSMISSION SERVICE GROUP 3

Technical Service Information

ZF8HP45 CUT AWAY VIEW

COMPONENT APPLICATION CHART

A BRAKE B BRAKE E CLUTCH C CLUTCH D CLUTCH

4x4 MODELS
4x2 MODELS
(Shown below)

P1 P2 P3 P4

ZF8HP45 CLUTCH APPLICATION CHART

CLUTCH
A B C D E TCC GEAR
BRAKE BRAKE CLUTCH CLUTCH CLUTCH CLUTCH RATIO
RANGE
P Applied Applied
R Applied Applied Applied 3.30
N Applied Applied
D-1st. Applied Applied Applied Applied* 4.71
D-2nd. Applied Applied Applied Applied* 3.14
D-3rd. Applied Applied Applied Applied* 2.10
D-4th. Applied Applied Applied Applied* 1.67
D-5th. Applied Applied Applied Applied* 1.29
D-6th. Applied Applied Applied Applied* 1.00
D-7th. Applied Applied Applied Applied* 0.84
D-8th. Applied Applied Applied Applied* 0.67
1. TCC operation available in gears 1 through 8, dependant upon throttle position, transmission fluid
temperature and vehicle speed. Uses a 235 Torsional Turbine Damper fully lockable, 40rpm max slip.
2. Failsafe is 6th gear
3. The B Brake is partially applied when stand still decoupling is activated Copyright © 2017 ATSG
Figure 2
4 AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

ZF8HP PLANETARY GEAR SETS

4 PLANETARY NOISE DIAGNOSIS

GEAR SET 1 GEAR SET 2 GEAR SET 3 GEAR SET 4 OUTPUT

GEAR (P1) (P2) (P3) (P4) RATIO

1st Gear Stationary Ineffective Ineffective 4.714 4.714

2nd Gear Stationary 0.667 Ineffective 4.714 3.143

3rd Gear 3.000 1.000 Ineffective 2.106 2.106

4th Gear 3.000 0.556 1.000 1.000 1.667

5th Gear 3.000 0.464 1.285 1.285 1.285

6th Gear 1.000 1.000 1.000 1.000 1.000

7th Gear Ineffective 0.670 0.839 Ineffective 0.839

8th Gear Ineffective 0.670 1.000 Ineffective 0.670

Reverse Stationary 0.670 -1.046 4.714 -3.289

Planetary Details:

Gear sets listed above are in order from the front of the transmission to the rear of the
transmission. P represents "planetary" or "gear set. " A gear set consists of an annulus (ring)
gear, a carrier with pinion gears and a sun gear.

1. The Input Shaft drives the P2 carrier and C clutch housing

2. The A brake holds the P1 and P2 sun sears stationary
3. The B brake holds the P1 annulus gear stationary
4. The C clutch drives the P3 annulus gear, the P4 sun gear and the E clutch housing
5. The D clutch connects the P3 carrier with the P4 carrier
6. The E clutch connects the P2 annulus gear to the P3 sun gear
7. The P4 annulus gear is connected to the P1 carrier via the P4 annulus drum (the long outer
cylindrical drum with holes roundabout)
8. The D clutch drum is integral to the P4 carrier, park gear and output shaft

Copyright © 2017 ATSG

Figure 3

AUTOMATIC TRANSMISSION SERVICE GROUP 5

Technical Service Information

B BRAKE OPERATION
DECOUPLING AT STAND STILL
Clutch Apply Press. A
Brake

Partial Clutch Apply Press. B

Brake

B Brake
Release

Clutch Apply Press. C

Clutch

D
Clutch

E
Clutch

.048" .040"

B Clutch Apply Valve B Clutch NIC Valve

Pre-Fill Pressure

Line Pressure

.062" X
.048"

X Holding Valve B
B Clutch Holding Valve Clutch Release

EDS-3
B

Solenoid Feed Pressure

First generation of ZF8 speed transmissions utilize a decoupling strategy of the B Brake. This
strategy is designed to provide fuel economy. The B Brake apply and release is entirely
hydraulically controlled without the use of a piston return spring. Newer generations employ a
return spring along with support software making these parts and transmissions incompatible.

When decoupling is activated, B clutch apply will be reduced to an approximate 20% slip.
This can be observed by looking at the turbine shaft RPM data in an appropriate scan tool.
Approximately 120 rpm's will be seen in drive at stand still, brake pedal fully applied.
Summary
The EDS-3 B Clutch Solenoid (N.V.) is at low duty cycle when at a stop in Drive with the brakes
applied. This lessens B clutch apply pressure where a controlled exhaust occurs at the B Clutch
Holding Valve. The partially slipping B clutch lessens engine load for fuel economy purposes.
Copyright © 2017 ATSG
Figure 4
6 AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

B BRAKE OPERATION
DECOUPLING AT STAND STILL

Standstill decoupling is realized by opening/slipping multi-disc brake B. The following input dimensions
are used for controlling the standstill decoupling:

Brake Light Switch: Standstill decoupling is only active if the service brake is applied. Once the service brake
is released, power transmission of multi-disc brake B is closed immediately even before an accelerator pedal
value is detected. In the vast majority of cases, the vehicle can be prevented from rolling backwards on
gradients.

Accelerator Pedal Value: If a defined accelerator pedal value is exceeded, standstill decoupling is
deactivated.

Transmission Output Speed: If a transmission output speed is detected, standstill decoupling is

deactivated.

Engine Speed: The converter torque is calculated from the engine speed and the turbine speed (rpm
differential) and the gearbox oil temperature.

Turbine Speed: The converter torque is calculated from the engine speed and the turbine speed (rpm
differential) and the gearbox oil temperature.

Gearbox Temperature: The gearbox oil temperature is used to calculate the converter torque. In addition,
standstill decoupling is only active within a gearbox oil temperature range of approx. 13 °C and 120 °C.

Slope Angle of the Vehicle: The vehicle's slope angle is used to adapt re-engaging of the clutch to the
slopes you drive off from.

To enable driving off free of deceleration and load alteration, multi-disc brake B is not completely opened. A
slight slip of approximately 20 % remains so that some torque is transmitted to the torque converter. If multi-
disc brake B was completely open, no torque would need to be transmitted to the converter (except the inner
friction in the gearbox). Jerking could result when driving off.

When at a standstill in the drive gear with the brake pedal applied, the input shaft rpm values can be as follows:

0 rpm when the B brake clutch is fully closed/applied.

Same as engine RPM when the B brake clutch is fully open/released.
Approximately 120 rpms when in the decoupling stage.

Figure 5

AUTOMATIC TRANSMISSION SERVICE GROUP 7

Technical Service Information

TYPICAL WIRING
TRANSMISSION CONTROL MODULE WIRING
(2013 Dodge Ram 1500 3.6L)
BATTERY (+)
HOT AT ALL
TIMES

POWER
DISTRIBUTION
CENTER
FUSE FUSE
94 57
10A 15A

11 C7 19 C3
A195
CAN C IGNITION BODY RADIO
A190 OFF/RUN
20 18 DASH CONTROL MODULE
START TRS
BR/RD YL/RD
CAN CAN CONNECTOR CONTROL MODULE PARK
FREQUENCY
C(+) C(-) OUTPUT SIGNAL HUB
17 1 2 C3 24 C1 2 C1
1315
17 D29 D30 F1 T824
18 18 18 18
VT/WT YL PK/WT YL/DB

SP2284 SP2508

20 29
1230
20 29 26 2
1200
26 2

13 5 6 9 15
FUSED CAN CAN IGNITION TRS TRANSMISSION
B(+) C(+) C(-) OFF/RUN PARK CONTROL
START SIGNAL
CONTROL
MODULE
OUTPUT

DATA DATA
BUS(+) BUS(-)
ESHIFT ESHIFT GROUND
4 3 14

IP D441 D440 Z908

18 18 20
CAN C WT/OR WT/BR BK
CAN CAN STAR
C(-) C(+) CONNECTOR
31 22
2 1 C6 1230
31 22
D439 D429
22 22
YL GY

5 6
1360
5 6
D441 D440
20 20
WT/OR WT/BR

1 8 8 6 7
FUSED CAN CAN DATA DATA SHIFT BY
B(+) C(-) C(+) BUS(+) BUS(-) WIRE
ESHIFT ESHIFT MODULE
(SBW)
GROUND
10
Z911
20
BK

G212 G206

Note: Terminal identification will vary among manufacturers and models.

Power, ground and CAN BUS terminals will be the most consistent. Copyright © 2017 ATSG

Figure 6
8 AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

TYPICAL WIRING
MECHATRONIC/TCM TERMINAL IDENTIFICATION AND LOCATION
(2013 Dodge Ram 1500 3.6L)
Harness Connector Case Connector

8
11 4
11 15
3
8 16 15
10 10 5
4 3 1
1 13 16

6 12 14 13 12 2
5 6
2 9
7 14
7
9

External wire
PIN # DESCRIPTION AND FUNCTION CIRCUIT COLOR
1 Unassigned
2 Unassigned
3 Data Bus (-) ESHIFT D440 WT/BR
4 Data Bus (+) ESHIFT D441 WT/OR
5 CAN C (+) D29 VT/WT
6 CAN C (-) D30 YL
7 Unassigned
8 Unassigned
9 Ignition Off/Run/Start Cntrl. Output F1 PK/WT
10 Unassigned
11 Unassigned
12 Unassigned
13 Fused B(+) A190 YL/RD
14 Ground Z908 BK
15 TRS Park Signal T824 YL/DB
16 Unassigned
Note: Terminal function is model dependent. Always refer to a
wiring diagram for the specific vehicle being repaired.
Copyright © 2017 ATSG
Figure 7
AUTOMATIC TRANSMISSION SERVICE GROUP 9

Technical Service Information

ZF8HP45 SOLENOID LOCATION AND IDENTIFICATION

Disclaimer: MV2 and MV3 Solenoids are Park release solenoids
in E-Shift ZF6HP Transmissions. ATSG assigned the same names
Park Hold for the Park Release and the Park Hold Mechanical Solenoid.
Mechanical MV3
Solenoid

Park MV2 EDS-7 EDS-2 EDS-5 EDS-4 EDS-3 EDS-6 EDS-1

Release N.V. (LP) (TCC) (C) (E) (B) (D) (A)
Solenoid N.A. N.V. N.A. N.A. N.V. N.A. N.V.

Copyright © 2017 ATSG

Figure 8
10 AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

ZF8HP45 SOLENOID APPLICATION CHART

PARK EDS-1 EDS-2 EDS-3 EDS-4 EDS-5 EDS-6 EDS-7

RANGE
(Component) MV2 N.V. (A) (TCC) (B) (E) (C) (D) (LP)
Solenoid type MV3 N.V. N.V. N.V. N.A. N.A. N.A. N.A.

Park OFF X TP X X X X*
Reverse ON X X X X X*
Neutral ON X TP X X X X*
D 1st gear ON X X** X X X X*

D 2nd gear ON X X** X X X X*

D 3rd gear ON X** X X X*
D 4th gear ON X** X X X*