Lovin_My_E.G[G]

i have a 94 eg and i swapped an si tranny in it but im havving a little problem...when im in first and go it grinds a little and when im in any gear and i let off the gas ( like if i were in 1st and wanted to sound like a badass i would let off the gas while still in gear..ya know? haha) when i do that it grinds..im thinking one of the bearings..OH and i DONT GRIND going into any gear AND NON of my gears pop out! so idk any ideas please....