Transmission whine after torque converter install.

[John]

1985 Chevy c10. 350 engine with th350c transmission.

I installed a torque converter on my th350c transmission. Install went well and everything bolted up fine. 3/16” gap between tc and flexplate before bolting up and the tc spun freely before bolting up. Filled up trans fluid after install and it was doing fine without noise. I drove it around the block a few times and pulled back in the driveway and this whine has been going on ever since. It happens in neutral/park and in gear. Double checked fluid level and it is good. Where do I go from here?

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