An Electronic controller for A500 (42RH) Transmissions

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KevinB

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Just wanted to put this info out there in case anyone else was looking. I'm planning out my build and had decided I wanted to go the 42RH route for the tranny. I dislike the previous solutions that others have come up with, because while they are effective, they're not exactly plug and play...and there's a lot of disparate part sourcing. I came across Compushift controllers recently and liked the idea of them, being more user friendly. However their website states their product is for the A518 (46RH) transmission. On a whim I emailed their staff and am being told that it will work fine on the 42RH as well, lockup or no. The only additional component needed is a Throttle Position Sensor, which they sell as well. Their TPS will accommodate Holley and Edelbrock setups. They have several different styles and options available.

In Addition, almost all of their product is made in the USA, and can display current vehicle speed, throttle position, transmission pressure, 4th gear/overdrive activity, torque converter clutch engagement, as well as drive an electronic speedo.

Some of you are familiar with this product already, and maybe already knew this information, but I had not seen it mentioned as an option for the 42RH. Note that this is not an endorsement, but this is probably the product I'll be using in my own build. Link to the controller is below:

COMPUSHIFT Mini for Chrysler A518/46RH and Chrysler A618/47RH
 
That is a nice option, too fancy and expensive for me but a cool kit.
Thanks for posting:thumbsup:
 
The 42RH is a hydraulic controlled trans and doesn't need a computer.
It only needs to know when to apply and disengage 12v to the OD and lockup solenoids and that can be done by using pressure switches plumbed off of the governor port of the trans.
The adjustable pressure switches can be set for different speeds by the adjuster under a rubber cap, and an adjustable vacuum switch can interrupt the circuit for kicking down when throttle is opened farther.
The most expensive thing that could fail would be a pressure switch and no external electronics are needed.

About half of what that kit costs, but hey it's another cool electronic toy available to us.:D
 
To each his own but carbs are a simpler devices and cheaper than EFI, yet the world continues to move towards EFI. Like it or not I don't care, but when I was looking for this option I couldn't find it. I just want others to know that it does exist.
 
Mike's a great source for info, and will make your harness to your specs. I've used one on a Cummins/47RH conversion in a 72 Chevy K20 truck for a customer, and it worked great. The controller even has a speed display option. Tunable shiftpoints for upshift and downshift for overdrive and lockup. Its as close to factory shift programming as you're going to get too.
You'll like the simplicity to it, and the precise shifting every time. Have fun with it.
 
To each his own but carbs are a simpler devices and cheaper than EFI, yet the world continues to move towards EFI. Like it or not I don't care, but when I was looking for this option I couldn't find it. I just want others to know that it does exist.

Till the EMP takes you out while on cruise! :rofl:
 
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