2005 Tahoe 4l80e swap tcc won?t lock
Hey guys, new here! I just swapped a 4l80e in my 05 Tahoe. I bought the conversion harness and wired the extra speed sensor up to the pcm. I did a segment swap from a 2005 Silverado 2500hd with the 4l80e. The first time I drive it after starting the vehicle the converter will lock in 3rd, it will shift into 4th and lock the converter in 4th for about 2 seconds and then it unlocks and won?t lock again! I can command it to lock through the hp tuners and it locks up every time. Otherwise the transmission shifts great as it was just rebuilt. Just looking for any ideas! Thanks in advance!
