Don, have you tried driving without the rear driveshaft? If there's no noise then it's probably the U joints you're talking about.

Be careful though, I drove a couple miles around town once and it felt different driving in front wheel drive. I'm not sure how it will handle at higher speeds.

Steve
My Website ||Gettin' off 4wheel drive club member
'93 4Runner V6 4x4 auto tranny
If you have to ask about a SAS, you're not ready for it.