Ok, it's the driveshaft. I was under it, and had my friend spin the tires. It clicks around the rear joint between the drive shaft and the diff. What to do?

If it's coming from the driveshaft ujoints, there are only two things to try AFAIK.

1. If there are grease fittings on the ujoints, try greasing them and see if that helps.

2, Replace the ujoints.

**Not sure why the sound would change when cornering if it's coming from the driveshaft. I'd think that it would be fairly constant when you're on the gas.

When I was a young bloke I owned a Ford Escort. You always knew when the uni's were starting to go in the drive shaft because they would squeak while the car was moving backwards. Universal joints are a strange animal at times.

....but S30 driveline u joints almost never wear out because they don't have to move angles at all...

....are you sure this is the problem? shake the driveline....it should have some play if it is that u joint...just replace 'em....

I haven't experienced a driveshaft ujoint failure, but the P.O. of my car did. The evidence of a failure of the front ujoint on the driveshaft is all over the tunnel of the chassis where the d/s beat the $hit out of the sheet metal before he could get the car stopped. Since that area is right next to the driver, it must have been quite an experience.