4r100 swap in my truck. Few questions.

stroken · Feb 28, 2014

Just put the 4r behind my 6.4 finished it up last night. I copied wiring off of another truck didn't have instructions. Few issues. The trans temp in the factory cluster doesn't work. Is there a wire I missed or is there another way around it? I'm also assuming why the fan is staying on constantly, because it doesn't have a trans temp reading? I appreciate all of the help in advance!

Mark Kovalsky · Feb 28, 2014

The cluster in your truck gets it's information from the PCM. The PCM also determines when the fan is on, and without a signal from the trans it's going to stay on.

You may need to get a sensor from a 5R110 and put it in the pan and wire it to your engine's PCM.

BFT · Mar 1, 2014

PM jhaddox or one of the fellas from MPD

extreme3807 · Mar 1, 2014

stroken said:
Just put the 4r behind my 6.4 finished it up last night. I copied wiring off of another truck didn't have instructions. Few issues. The trans temp in the factory cluster doesn't work. Is there a wire I missed or is there another way around it? I'm also assuming why the fan is staying on constantly, because it doesn't have a trans temp reading? I appreciate all of the help in advance!

The trans temp gauge will not work with your factory cluster on a 4R swap