Tom,
Just tell the tech you want the trans to shift to 4th gear instead of 5th gear like it is currently set when the jake brake is activated. I had Newell do it. The tech just plugged the reprogrammer into the port by the steering column. It was originally programmed to go to 5th gear when the jake came on, but that is only 300 rpm. I live in a very hilly area where the extra jake braking power is needed.
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Steve
Newell
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