The Converter Is Not Locking Up At All. So You Need To Get A Lock Up Controler Or A New Converter. Sometimes This Happens When You Chip The Powerstroke. You Can Put In A Shift Kit From
trans-go But You Will Have To Pull The Trany To Do It. If You Have The Funds Put An Aftermarket Converter In At The Same Time.you Will Get A Longer Trany Life And Better Launch Out Of The Hole. This Will Be Cheaper Then A New Trany At $3500. With Out It Fully Locking Up It Will Hurt The Trany Under Hard Load. Also Replace Your Trany Fluid With Syntic.