Transmission Assembly - 8HP75: Notes

DESCRIPTION 

Courtesy of CHRYSLER GROUP, LLC

Courtesy of CHRYSLER GROUP, LLC

1 - Torque Converter	8 - C Clutch
2 - P1 Planetary	9 - E Clutch
3 - P2 Planetary	10 - Valve Body
4 - P3 Planetary	11 - B Clutch
5 - P4 Planetary	12 - A Clutch
6 - Output Shaft	13 - Oil Pump
7 - D Clutch	14 - Input Shaft

Listed below are the features and components of the 8HP75 transmission:

• The 8HP75 is an electronic eight-speed automatic transmission. Eight speeds allow the engine to maintain its optimal rpm range, increasing fuel economy and performance.
• The transmission case is a single-piece unit.
• The starter pocket, cooler line fittings, and manual park release lever are located on the driver's side of the case.
• The transmission wire harness connector and oil fill plug are located on the passenger side of the case.
• The two-wheel drive model uses a flanged output shaft connection while the four-wheel drive model uses a sealed, externally splined output shaft to form a dry connection between the adapter plate and the transfer case.
• Transmission control is performed by the TCM based on hard-wired and Controller Area Network (CAN) bus signals from sensors and modules.
• The Transmission Control Module Assembly (TCMA), which is integrated into the valve body, provides fully synchronized clutch-to-clutch shifting through four planetary gear sets.
• The TCMA includes a mounting plate that holds the Transmission Control Module (TCM) and a molded wiring harness for connection to various transmission sensors and solenoids.
• The valve body assembly contains all the sensors and solenoids required for operation, completely inside the transmission.
• The TCM receives driveability data from the Powertrain Control Module (PCM) and other modules over the CAN-Chassis (CAN-C) bus.
• The TCM also receives shift lever position information from the Electronic Shift Module (ESM) over a dedicated transmission CAN bus.
• The TCM processes this input data and controls operation of the torque converter clutch, park lock system, solenoid valves, and pressure regulating valve.
• The input and output speed sensors are Hall-effect sensors that measure shaft rotational speed.
• The input speed sensor is located at the top, near the center, of the of the TCMA and reads input shaft speed from the magnetic ring on the P2 carrier.
• The output speed sensor is located at the back of the TCMA and reads output shaft speed from the P4 carrier.

IDENTIFICATION  In the area of location (A) there are two barcodes and their corresponding alphanumeric codes. The top code identifies the COMPONENT TRACKING NUMBER. The bottom code identifies the PART NUMBER.

Courtesy of CHRYSLER GROUP, LLC

The table below shows the gear ratio for each transmission gear range.

GEAR	RATIO
1st	4.714
2nd	3.143
3rd	2.106
4th	1.667
5th	1.285
6th	1.00
7th	0.839
8th	0.667
Reverse	3.317