heres the diff as far as trans are concerind 2.2 has a 2800 stall torque coverter and 2.5 has a 2100 stall converter ratios are diferant 2.5 is 4.44 2.2 is 4.11 brakes are smaller on 2.2 cars sway bars and struts are smaller wheels and have less options on 2.2 cars the engines interchage not to badly exept for egrs on some have put many a 2.2 in 2.5 hole