On my T-5, it was caused by the driveshaft pinion flange bolts backing off just a bit. Check those. I see you already have the aluminum driveshaft cause the stock one is a big suspect.
Check the harmonic balancer if it also vibrates in neutral.
In general, when any transmission/gear related item is "going" then you will hear shrieks and whines. I love it! When my T-5 went, the input shaft retainer broke and the car sounded like it was in reverse through all gears and it built to a loud hiss. People thought I had a turbo!
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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