What if, Black Box PCM repurposed as TCM?

[Montecarlodrag]

With his year L33 the EBCM would need the BCM too, right? On DBW truck/suv doesnt gen 3 route TAC control/external control and can comms through the BCM. I could be on crack here. Just trying to think what all we have kept on full chassis swaps. For some reason the BCM is sticking in my mind for proper operation of EBCM.

Well, He didn't say which year is the L33 computer. If it's Gen4 with CAN bus it will be much more difficult.
For Gen3 controllers there is no need for a BCM. TAC module, ABS and everything work without a BCM since the Class2 bus comes from the PCM to all other modules.
Gen4 controllers use the BCM as a bridge for Class2, but the EBCM is tied to the high speed GMLAN, the problem is not the BCM but the added complexity. I have not tried this but have done similar things and I can say Gen4 electronic systems are a PITA, a lot more work and time for little to no advantage using them.

I think there are no Gen4 L33 engines, so I should be a Gen3