0411 tranny issues

[_nickjoseph]

97 k1500 5.7 with 4l60e. Just did a 0411 swap. I’m now getting a very hard shift at 10mph, no lockup around 45 ish like I normally do and stays around 2,000-2,500 rpm al the way up to 70. Didn’t go faster then that. Never had these issues before. It always shifted smooth and had the lockup. What can I do. Is it a pin issue or tune

 

[Schurkey]

When my '97 K2500 7.4L/4L80E had no converter lockup, I discovered that if the computer senses misfire, it won't lock the converter.

Had a cracked spark plug in #8. $2 spark plug fixed my misfire AND my non-locking converter.

Connect a scan tool, verify no misfire, look at data stream for anomalies, and verify no stored codes.