0411 for a 2WD to 4WD?

[55Belair]

Is there a quick way to tell if an ECM is for a 2 or 4WD by looking at the tune? I have the ECM but just not sure what it came out of as it was given to me.

Swapped a 1999 4.8 into a 2001 Silverado that used to have a 5.3. (Cause the 5.3 was pooched and we had the 4.8 laying around the shop) I have the said 0411 ECM here with a 4.8 tune in it so I was just going to license that and use it but not sure what I have to do to get 4WD to work in the 2001.

Did a bunch of searches but can't come up with a definitive answer. Thanks for any help anybody can provide.

[blindsquirrel]

5th digit of the VIN. Ever heard the term "C/K truck"? C is 2WD, K is 4WD. Same for other platforms where both were offered, it will be there in the VIN.

[55Belair]

You learn something new everyday! Thanks for that.

Does anyone know if there is much of a difference between a 2WD tune or a 4WD tune. From what I found out there may be a few extra wires to the ECM of a 4WD but am wondering if I can use this 2WD ECM on the 4WD without making major changes.