So, fortunately for you, this diagram isn't for a 2008 GT500. Instead, it's for a 2016 GT/GT350. But what it does do is provide some context for how the ABS functions, so I thought it might be helpful.
There's two-way comms between most of the modules on the diagram. The PCM for torque management, clutch position, gear selection, and so on. The BCM handles things like battery condition, doors open, parking brake and so on. The IPC blinks the lights on the dash for traction control operating and driver information. The FCIM manages the buttons for launch control and traction control off and so on. The RCM knows about vehicle dynamics - is it sliding or pivoting or moving sideways. The CCM tells ABS if cruise is on or off, and finally the PSCM provides a steering wheel angle to compare with the RCM vehicle dynamics to figure out of the vehicle is under driver control or not.
PCM - power train control module, BCM - body control module, IPC - instrument panel control module, FCIM - front controls interface module (console buttons), RCM - restraints control module (airbag launcher), CCM - cruise control module and PSCM is power steering control module.