Review on Restorer Transmission Additive Mechanical Treatment by Scott Channell

My 1993 Corvette with 65,000 miles. The ZF 6-speed gearbox is known to be a loud beast. I changed the oil to Redline MT90 and it got a lot quieter, but still not quite. I changed the oil again and refilled 2 bottles of Resource for manual transmissions. After driving about 100 miles the difference is like night and day. Is it very quiet? No! But that's close to when it was new. I'm a lucky tourist.