Hi SRT6exy,
Just a side note, you mentioned you got a new RCM and plugged it in so this probably isn't your problem, but it's easy to check. Sometimes the black rectangle in the IC comes from a bad traction control relay in the RCM not providing power to the TCM - if the tcm is not powered, the pcm again doesn't know what gear you're in and won't start. Maybe a quick check before you tackle the SLA is to see if you're getting 12V to the TCM at the TCM connector ( with battery connected, everything plugged in except the tcm, ignition to the on position).
-Jerry