Feels/sounds like tranny hitting floor

[Billybronco2]

Hello everyone. Found this site on my great search for Bronco 2 knowledge. This one has me stumped. Each time I hit a bump in the road it sounds/feels like the transmission is bucking into the floor boards. It doesn't move a whole lot (can't really see the shifter move) but I can feel it in my feet. I climb under there and found an area that has about 3/4 inch clearance from the top off the tranny to floor board. I replaced the tranny mount a couple of days ago, old one was original and destroyed.. Prior to me replacing the tranny mount, i could primarily feel the bump/vibration on turns. Everything else on the truck works fine, runs like a champ. Any ideas? I open to any help.

1988 Ford Bronco 2
2.9 5 speed 2wd