T-56 Magnum noise at speed

[heynow14]

Hey us-
Looking for some help from those who know the T-56. Mine has only about 250 miles. ZZ4 350 crate motor in early Camaro.

On freeway above 60 if I push clutch in, I get a noise that sounds like something 'dragging'..not a grinding...but still not right. It seems to do it with clutch not pushed in (off throttle) too but it's less obvious. Under power it sounds fine although things are louder so who knows. So, with clutch in or coasting in gear, I get the sound. Tremec suggested switching to synthetic fluid. It made no difference with the noise.

Around town, under say 50mph, it shifts and drives great...this is bugging me and I want to be sure I'm not making it worse by driving it.

Thoughts?

Thx,
Nick