I have a question for a 2003 GMC ext cab 4x4 truck

[Charles Burton]

I have a 2003 GMC pick up 4x4 ext cab with a 5.3 liter V8 I have put another transmission in it and it still pulling up the same codes as the old transmission would it b the TCM back in it and could I go buy a used one out of another truck ans put in it with out having to have it programed and would one out of a chevy Silverado work in the gmc as long as both has the 5.3 liter V8 and they both are ext cab and would it mater if one has the floor shifter for the transfer case and the other has the push button for the transfer case 

[newdude]

8 minutes ago, Charles Burton said:

I have a 2003 GMC pick up 4x4 ext cab with a 5.3 liter V8 I have put another transmission in it and it still pulling up the same codes as the old transmission would it b the TCM back in it and could I go buy a used one out of another truck ans put in it with out having to have it programed and would one out of a chevy Silverado work in the gmc as long as both has the 5.3 liter V8 and they both are ext cab and would it mater if one has the floor shifter for the transfer case and the other has the push button for the transfer case 

 

 

What codes do you have?

  

[asilverblazer]

4 hours ago, Charles Burton said:

I have a 2003 GMC pick up 4x4 ext cab with a 5.3 liter V8.

 

I have put another transmission in it and it is still pulling up the same codes as the old transmission.

 

Could I go buy a used TCM out of another truck and put in it with out having to have it programed?

 

Would one out of a Chevy Silverado work in a GMC as long as both have the 5.3 liter V8 and they are both ext cab?

 

Would it matter if one has the floor shifter for the transfer case and the other has the push button for the transfer case?

What is the actual problem?