Car ran flawlessly in the 6.8 range last year after a rebuild and trans tune from transmissioncenter.net. I adjusted shift points using a spreadsheet and left their settings alone per their recommendations.
The car was bolt-on only last year, this year it has a 376 LSX crate engine. The car will not shift in 1st without being in the rev limiter or something similar for a bit. I adjusted the initial shift point way down over the night, starting with a point that worked flawlessly at about 6400 RPM last year, raised redline, and tried lowering shift time a bit. Nothing made a noticeable difference. Any input would be greatly appreciated on this one.