[powerband chaser 302]

I think this may be a trans mount but im not too sure. When trying to park or moving short distances uphill in forward and reverse I hear my trans shudder or shake. It only happens when its under load then I suddenly push the clutch in. Its not a clutch sound. Its like I can hear the parts inside the trans shake left to right. If im on level ground and just drive normal from a stop first gear is normal no sound. Then second gear sometimes seems to have a lag to it. I let the clutch out all the way then a half second later I feel it engage. But it only does this sometimes. The shifter is stock and I dont feel or see anything out of the norm. Any ideas?

2003 GT 5spd
Charcoal Grey
Mac Exhaust with Cut-outs