75 Dually build

[Dieselwrencher]

Originally Posted by 75Dually

Ryan,

As always you have some amazing knowledge! Question: would it not be easier to use an older ecu from that gen dodge? When you say the converter is turned on and off are you talking about the overdrive or something else? I still have the 1991 Dodge ECU from the donor truck I could use, that is if it talks to the trans or not.

No because the shift points won't be right and you won't have any good way to tune it. I have been involved with a few swaps that tried that and they got tired of it real quick. (1 was a 47re too) The TC clutch would be unlocking and locking or not unlocking at slow speeds, and the same with the OD. It can lead you to hate the vehicle in a hurry.

The 91 Dodge would ECU probably wouldn't work because that truck was a 5 speed truck wasn't it?

1st, 2nd, and 3rd, are all shifted hydraulically through the valve body but there are 2 solenoids on the valve body that operate LO and OD. One sends the fluid through the input shaft to lock and unlock the clutch in the torque converter. This is for lock up. The other sends fluid to the piston for the overdrive assembly on the back of the trans. These transmissions are basically a 727 that have been upgraded/updated over the years. That is one nice thing about them. Some parts interchange. There are many pieces you can upgrade to make these a really nice trans. You can go mild to wild with them.

https://www.hgmelectronics.com/compu...and-a618-47rh/

[75Dually]

Originally Posted by Dieselwrencher

No because the shift points won't be right and you won't have any good way to tune it. I have been involved with a few swaps that tried that and they got tired of it real quick. (1 was a 47re too) The TC clutch would be unlocking and locking or not unlocking at slow speeds, and the same with the OD. It can lead you to hate the vehicle in a hurry.

The 91 Dodge would ECU probably wouldn't work because that truck was a 5 speed truck wasn't it?

1st, 2nd, and 3rd, are all shifted hydraulically through the valve body but there are 2 solenoids on the valve body that operate LO and OD. One sends the fluid through the input shaft to lock and unlock the clutch in the torque converter. This is for lock up. The other sends fluid to the piston for the overdrive assembly on the back of the trans. These transmissions are basically a 727 that have been upgraded/updated over the years. That is one nice thing about them. Some parts interchange. There are many pieces you can upgrade to make these a really nice trans. You can go mild to wild with them.

https://www.hgmelectronics.com/compu...and-a618-47rh/

I wounder if that compushift will talk to the 46RE, it says 46RH on their website.

[Dieselwrencher]

Originally Posted by 75Dually

I wounder if that compushift will talk to the 46RE, it says 46RH on their website.

I doubt it. The RE uses a governor sensor in the valve body and the valve body connector has more wires. You could call them and see if they would make or modify a harness for you. Your trans is a 47rh if it is from a 94 or 95 Dodge diesel/V10 with 3 pin valve body connector. The 46's were only in gas applications. The 46rh's were behind the 360 gas engines for what ever reason and the 46re's went behind 318s and V6s.

[75Dually]

Originally Posted by Dieselwrencher

I doubt it. The RE uses a governor sensor in the valve body and the valve body connector has more wires. You could call them and see if they would make or modify a harness for you. Your trans is a 47rh if it is from a 94 or 95 Dodge diesel/V10 with 3 pin valve body connector. The 46's were only in gas applications. The 46rh's were behind the 360 gas engines for what ever reason and the 46re's went behind 318s and V6s.

So how do tell the difference?