It is the same color wire as for the 700, Red with a Green tracer, but it is in a different location than on the 700. If you unhook the plug from the ECM then look at the plug holding it right side up, it is the bottom right hand end wire. The wire directly above it is Yellow and the wire directly to the left of it is Black with a Yellow tracer.
Removing that red/green wire from the plug, or cutting the wire disables the diff lock limiter so that full power is available when the front axle is locked.