I swapped a rebuilt 4l80e in my truck after my old one took a dump could it be an electrical wire or something? Here are the codes it's giving me p0741 p0752 p0756 p0757 p0758 p1810 p1860 p1870 p1875 it's an 02 gmc 1500hd

 

Check your fuses. Everything 12v transmission related in your fuse box.

 

I found out it was some wires touching on the main transmission harness