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The reason that you need gl4 is because of the brass synchros our transmissions have. The additives in gl5 will eat these away and make them take a shit. If you have a tranny that runs good with gl5, just give it a couple months of some repeated hard use and you'll wish you had used gl4 from the beginning.
OP, you sound like you have a pilot bushing problem. It's the little bushing that goes between the end of your crank and the trans input shaft. Once it starts to go it makes a whine, and eventually it'll make a whine in all gears. Also you could check your tranny mount, if it's worn it could be stressing the pilot bushing/input shaft and causing the whine.
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