I took a look at his gen1....I'd bet the farm its a transmission output shaft bearing gone south thats making a bunch of whining noise...you could feel the vibration in the shifter to. Poor kid just got done forking over $5k for an engine swap, and now the trucks gotta come apart again to likely rebuild the 5 speed transmission. Idk what it is about a gen1...maybe they were good in their day, but as they get older, they're nothing special. Seems a lot of low educated owners now gravitate toward them. I may have given him some incentive to unload that pos, after letting him take a test drive in my truck. He was completely shocked it was a tacoma he drove...said it was like riding in a caddy with big power compared to what he was use to.