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After a little more research, I have found the kit to install the 8HP75 8 speed automatic in our trucks. It requires some wiring, figuring out a flexplate with proper backspacing, as well as the 8HP shifter. The parts (minus the transmission and flexplate) can be had from sound german automotive for 1500 bucks. The Rep also emailed me the installation instructions, which I will copy below for anyone who is interested. This is definitely going on my list of things to do for this truck. I think the 8 speed is what this truck needs to really rock.
Below is the copy of correspondence from Sound German Automotive
8hp kit installation instructions.
The 8hp kit is as close to plug n play as possible. The required inputs for the transmission to work with this kit are RPM, TPS, Torque, Brake switch or Brake lamp input. All other wiring is optional and for your use as needed. We provide Neutral safety output and Reverse light output to ground only. Speedometer output is a programmable and should work with any modern electronic speedometer or a speedometer driver such as Speedhut Speedbox. The harness is made to receive inputs via CAN or discrete wiring. Both are not needed. One or the other. This allows easy installation and no calibration requirements for supported CAN based ECUs. Also wiring with aftermarket ECUs and even a Carb engine or diesel with a TPS sensor and RPM sensor. The discrete inputs are programmable for virtually any sensor.
Note: After calibration the Save Cal Command button at the top must be pressed and then the control module must be powered down and then disconnected from Battery power for 5-10 seconds for the changes to take effect.
Some adjustments of setup are available in the PCS control module. All Calibration of the transmission is done via OBD to the 8hp control unit as it would be done in the factory vehicle. Aftermarket tuning devices will be required. The PCS software and cable will not make adjustments to the 8hp TCM calibration.
Mopar Crate or other factory Mopar ECUs with or without Star connector:
Power and Ground:
There are two power inputs. A switched 12vlts to be wired to power when the key is on and a constant 12vlt battery input. Ground to chassis or battery ground. These all must be secure and reliable. Power must not drop during cranking and check that ground differential during cranking or other high loads is not high. Either of these scenarios can cause the Control module to lose power or drop to a critical level momentarily and turn off. This can cause starting issues when using the N/S output and others.
Plug C4 With Star connector:
Connect from PCS harness to Mopar Star connector any position.
No Star Connector:
If installing into a production car without Star connector. Find CAN-C in a convenient location to splice into. Typically, white/green is CAN high and White/blue is CAN low. Nag1 cars it is easy to do this at the original Nag1 TCU that you will be removing. This is also a good location to grab switched ignition input for the yellow wire. Diagnostic CAN-C at your OBD will not work. Also if you are swapping a Nag1 out or RAM RFE the TRS park from the shifter needs to be grounded to remove your key and sometimes shut your engine off. Also BTSI input can be used for Brake input if you have a potentiometer brake travel sensor instead of a switch.
Plug C1
Plug into rear passenger side of the transmission.
Plug C5
Plug into the 8hp shifter.
Unterminated wires:
Brake input Gry/Blk to brake switch. It is calibrated to 12vlt input for the switch by default but can be calibrated to a ground contact as well.
Neutral Safety output from PCS harness Pink/Blk to Mopar harness N – Color: DG/OG – Gauge: 18 – Clutch Interlock:
Reverse lights output to ground side control of a relay for activating reverse lights.
Speedometer output:
This is a signal output to run and electronic speedometer. The Orange/wht wire will go to signal input of the speedometer. If the speedometer instructions show a 3 wire sensor diagram. 5vlt Ref and Signal ground are not required. These two wires are for operating an independent sensor. Power and ground to the Speedometer is required and this signal wire.
PCS software for monitoring data:
Please download the PCS tuning software at this address. https://www.powertraincontrolsolutions.com//functions/download.php?dir=Software&file=TCM2800_Tuning-Install.exe
Install the software and Read the calibration from the control unit using the Read CAL tab at the top; with the Eyeball. Save this file on your computer. Go to Software Setup select Tuning Mode / Advanced. Your screen should look like this after this is done.
After this open the Monitor Screen using the Monitor tab which looks like a speedometer at the top it will open the lightweight monitor by default. Change this to TCM 2600/2800 Datastream in the Selected Monitor pull down in the window and you should be able to see RPM, TPS, Turbine Speed, Lever position, Current Gear and vehicle speed. (See below) As well as other input output functions. With the engine running you should see RPM and Turbine speed and if your foot is on the brake digital input 1 and Cancel TCC should be on. You should be able to remove the shifter from Park if these conditions are met. If you override your shifter then it will not go into gear. The transmission will not come out of park
if the engine is not running unless you use the manual override lever on the driver’s side of the transmission.
Below is the copy of correspondence from Sound German Automotive
8hp kit installation instructions.
The 8hp kit is as close to plug n play as possible. The required inputs for the transmission to work with this kit are RPM, TPS, Torque, Brake switch or Brake lamp input. All other wiring is optional and for your use as needed. We provide Neutral safety output and Reverse light output to ground only. Speedometer output is a programmable and should work with any modern electronic speedometer or a speedometer driver such as Speedhut Speedbox. The harness is made to receive inputs via CAN or discrete wiring. Both are not needed. One or the other. This allows easy installation and no calibration requirements for supported CAN based ECUs. Also wiring with aftermarket ECUs and even a Carb engine or diesel with a TPS sensor and RPM sensor. The discrete inputs are programmable for virtually any sensor.
Note: After calibration the Save Cal Command button at the top must be pressed and then the control module must be powered down and then disconnected from Battery power for 5-10 seconds for the changes to take effect.
Some adjustments of setup are available in the PCS control module. All Calibration of the transmission is done via OBD to the 8hp control unit as it would be done in the factory vehicle. Aftermarket tuning devices will be required. The PCS software and cable will not make adjustments to the 8hp TCM calibration.
Mopar Crate or other factory Mopar ECUs with or without Star connector:
Power and Ground:
There are two power inputs. A switched 12vlts to be wired to power when the key is on and a constant 12vlt battery input. Ground to chassis or battery ground. These all must be secure and reliable. Power must not drop during cranking and check that ground differential during cranking or other high loads is not high. Either of these scenarios can cause the Control module to lose power or drop to a critical level momentarily and turn off. This can cause starting issues when using the N/S output and others.
Plug C4 With Star connector:
Connect from PCS harness to Mopar Star connector any position.
No Star Connector:
If installing into a production car without Star connector. Find CAN-C in a convenient location to splice into. Typically, white/green is CAN high and White/blue is CAN low. Nag1 cars it is easy to do this at the original Nag1 TCU that you will be removing. This is also a good location to grab switched ignition input for the yellow wire. Diagnostic CAN-C at your OBD will not work. Also if you are swapping a Nag1 out or RAM RFE the TRS park from the shifter needs to be grounded to remove your key and sometimes shut your engine off. Also BTSI input can be used for Brake input if you have a potentiometer brake travel sensor instead of a switch.
Plug C1
Plug into rear passenger side of the transmission.
Plug C5
Plug into the 8hp shifter.
Unterminated wires:
Brake input Gry/Blk to brake switch. It is calibrated to 12vlt input for the switch by default but can be calibrated to a ground contact as well.
Neutral Safety output from PCS harness Pink/Blk to Mopar harness N – Color: DG/OG – Gauge: 18 – Clutch Interlock:
Reverse lights output to ground side control of a relay for activating reverse lights.
Speedometer output:
This is a signal output to run and electronic speedometer. The Orange/wht wire will go to signal input of the speedometer. If the speedometer instructions show a 3 wire sensor diagram. 5vlt Ref and Signal ground are not required. These two wires are for operating an independent sensor. Power and ground to the Speedometer is required and this signal wire.
PCS software for monitoring data:
Please download the PCS tuning software at this address. https://www.powertraincontrolsolutions.com//functions/download.php?dir=Software&file=TCM2800_Tuning-Install.exe
Install the software and Read the calibration from the control unit using the Read CAL tab at the top; with the Eyeball. Save this file on your computer. Go to Software Setup select Tuning Mode / Advanced. Your screen should look like this after this is done.
After this open the Monitor Screen using the Monitor tab which looks like a speedometer at the top it will open the lightweight monitor by default. Change this to TCM 2600/2800 Datastream in the Selected Monitor pull down in the window and you should be able to see RPM, TPS, Turbine Speed, Lever position, Current Gear and vehicle speed. (See below) As well as other input output functions. With the engine running you should see RPM and Turbine speed and if your foot is on the brake digital input 1 and Cancel TCC should be on. You should be able to remove the shifter from Park if these conditions are met. If you override your shifter then it will not go into gear. The transmission will not come out of park
if the engine is not running unless you use the manual override lever on the driver’s side of the transmission.
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