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ASE A3 stresses gear train analysis. Countershaft bearings are loaded in all gears except direct (input and output shafts locked together). Synchronizers cause grinding. Input bearings make noise in all gears. Clutch discs slip, not whine. ASE requires teardown inspection.

ASE A9 stresses airflow and exhaust. A restricted exhaust traps hot gases, raising EGT and lowering power. Glow plugs affect starting. Starters affect cranking only. Coolant in cylinders causes white smoke, not high EGT. ASE requires backpressure testing.

ASE A3 stresses driveline diagnostics. Inner CV joints carry torque during acceleration; wear causes vibration under load. Outer CV joints make clicking noises in turns. Wheel bearings produce growling at all speeds. Clutch discs cause slipping, not vibration. ASE requires test drives under load to isolate inner CV joint issues.

ASE A4 highlights suspension height issues. A broken or sagging coil spring will lower ride height on one side. Power steering fluid only affects steering assist. Caster affects alignment, not ride height. Tie rods cause play, not ride height changes. ASE requires ride height measurement and spring inspection.

ASE A2 focuses on hydraulic and electronic shift control. A faulty pressure control solenoid can cause excessive line pressure, resulting in harsh gear changes. Brake fluid has no effect on automatic transmission shifting. Spark plugs and clutch bushings are unrelated to automatic transmissions. ASE requires scan tool testing of solenoid operation and line pressure monitoring.