LS engine swap info

[69BUCKET]

I am running a TH350 behind the 5.3...no ABS, traction, or cruise. No modifications to engine, just stock DBC set up.

I will look at rear end for code to see what I have. Truck has never been running while in my possesion, so no idea if current Speedo gear in trans. is being translated into correct speed. It is a fresh rebuild.

I decided to run a VSS sensor instead of hoping I had no issues w/o it. I am sending ECM to lt1swap to be sure it is done properly. On his site he mentions tire size and gear ratio doesn't matter if I'm running a TH350. As stated before, Dakota Digital asked me what signal was from ECM...128K or something else. I told him I have no idea and didn't say how I can find out. So I am hoping lt1swap can tell me when he gets ECM so I can order correct sensor. Or can anyone reassure me of what part will work with flashed ECM from lt1swap?