i got the engine ,trans ecm ,tcm . all from the same truck 2008 silverado . used a howell wiring harness. i took out the vats. changed the tire size and gears. but the trans will not shift properly. it up shifts very quickly. and wont down shift at all. it not setting any codes. it will pull all 4 gears. the only down shift is if you do it manually. is there something i need to change in the tune for the swap. after i changed the the tires and gear the speed out put on the vcm scanner is correct . but the trans still shifts the same..it has a 40 tooth output speed sensor . but im not sure if the input turbin speed sensor is reading . i made sure the wiring harness is for the 4l70e . and it is.