okay i just bought a 97 eclipse GST 5 speed rebuilt motor and tranny with 41000 miles on it with a Fidanza light weight flywheel quaife LSD the car was advertised on craigslist for 6500 but rate when i went to test drive it i guess somthin happend the the transmission the guy said and so i got it for 4500 instead he said the trans mission is blown

now when i put the car in gear from 1st i let off the clutch it moves then then motor and tranny jumps up (i think from motor and tranny mounts) and the tranny makes a knocking noise then the Front wheels lock up what do you think the problem is do i need to get the tranny rebuilt cause i dont want to get rid of the LSD ?? please help