It sounds like the rear end - near the differential - but it could be the tranny. It whines up until 60 mph, then doesn't whine anymore. Whines louder under acceleration. Tends to not whine if cruising at constant speed at any speed.

I have checked the diff has oil - all good.

I have changed the driveshaft bearing and rear flexdisk. no change.

Also, it vibrates up until 60mph too, so I am thinking they're connected - the whining and vibrating. Sounds like a sex post, whining and vibrating.... hmmmmm

Anybody got any ideas?

There is also a crackling/ popping type noise at low speed - but that I think it the right CV joint or boot going.

Thanks.