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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,857 Posts
Welcome to Allpar. Ram HD? What year and engine please?
The output shaft speed sensor is important as it signals the PCM that the vehicle is in motion during a decel. The PCM would normally hold the IAC open during decel to let air in, like an electronic dashpot for stick-shift vehicles and prevent stalling. It can still idle fine.
The speedometer can run off the ABS sensor if no transmission speed sensor is present.
 

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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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23,857 Posts
No, the 8 pulses per turn of the drivetrain speed sensor is much different than the much higher pulse rate of the rear axle ring gear teeth. One will not substitute for the other. The cluster is able to get speed/distance info right from the ABS module.
Do you still have your old transmission for parts?
The CPS should be OK as it will usually either work OK or not at all.
 

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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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23,857 Posts
You can explore tapping into the vehicle control module communications bus for the speed signal. I don't know if the PCM can understand a different signal source or protocol other than what it gets from the transmission output speed sensor.
You may need to find the correct transmission tailshaft and housing and get the truck back to the way it originally was.
 
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