I tuned a DI 5.3 swapped C10 awhile back with a 6l80 trans - everything went smooth no issues - now a few months later truck is back. Trans goes straight into 5th gear and stays there - I haven't ever seen issue like this before... really can't find anything tuning related and feel i just have a bad shift solenoid....
Hoping someone has seen this before....Attachment 121847Attachment 121848Attachment 121847Attachment 121848
