thump on hard acceleration, Rear transmission mount?

[ndkpyro]

My 03 v6 has had an issue when accelerating hard locked in 1st or 2nd it will thump if you let off and then give it more gas. Motor mount is new (2 months old). Today I replaced the front transmission mount that was starting to tear. Got it all bback together and it still does it . I started to take the rear mount off to replace the insert on that one too but I can’t figure out how to get the bottom bolt out. There is not even enough room to get a short socket on there. Has anyone else replaced the insert on their rear transmission mount?