This tcm was removed from a 2003 Chevy Silverado 2500 hd with the 8.1 vortec and auto Allison behind it. Please match part numbers wiring pigtails included approximately 6” in length the pigtails are a common fail point as the wiring makes a 90 degree bend and commonly wears out causing all sorts of odd transmission issues. The item you see is the one you shall receive, ships free in the lower 48 states of the US.