ok, Im looking at a '90 GT to replace my poor tired '89 4 cyl. from what i've seen the car's got the HO version of the motor, busted A/C (the guy has the parts for it, but im gonna pull the A/C out of it anyway, it's too much weight) and a 5-speed. the option im looking for is to see if it's got the Trac-Lock rear end. how do you tell without pulling the Diff cover off?