7427 Rev limiter / 4L80E question

[brian617]

Yes , Pin F8 on a '7427 is the 4X4 Low range signal , X-fer case has a ball switch that sends a signal to the PCM when in 4 low , thereby modifying the shift firmness .

At least that is the way I understand it , works that way in my '93 3500 .

TOM

The ball switch is for front axle lock. Must be another source for 4 low???