i'm still learning with this kinda stuff. but when he steps on the gas, is the driveshaft turning?
i'm pretty much a moron when it comes to this stuff, but my guess is if the driveshaft is spinning, its something with the rear end. if the driveshaft isn't spinning, i'd like to say it could possibly be something in the tranny.
does it do this in all gears? like low, 2nd, drive, overdrive, reverse.