rear end or transmission problem?

It's possible that you are throwing the trans fluid over to the side and sucking air.
Other than that, its not the trans or rear end.

Is this under acceleration, or just a sharp corner?

under acceleration as in foot to the floor but not increasing in speed due to it being up hill and having a 170 slant.

new-ish shocks kybs replaced 5 years a go. deffinatly worn motor mounts but not broken.

i doubt im lifting a tire but ill have some one check it