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If slipping is limited to overdrive, the problem is in the overdrive clutch or solenoid. Engine oil, mounts, and injectors do not cause gear-specific slip. ASE G1 emphasizes diagnosing solenoids, clutches, and electronically controlled shift ranges.

A slowly sinking pedal indicates internal fluid bypass past the master cylinder seals. Worn pads and air cause low or spongy pedal feel, not gradual sinking. ABS sensors trigger warning lights but not this symptom. ASE G1 stresses master cylinder diagnosis.

A clunk when shifting between drive and reverse is typically caused by excessive play in the differential gears, known as backlash. This results in a loud clunk as gear teeth engage under torque load. A worn clutch plate would cause slipping, not clunking. Alternator belts and ignition timing do not cause driveline noise. ASE G1 course objectives highlight identifying noises associated with drivetrain wear, including differential and axle components.

If the fluid is correct but shudder occurs at low speeds, the pump is likely weak and unable to provide sufficient hydraulic pressure. Tires, coils, and gaskets are not involved. ASE G1 emphasizes hydraulic assist system operation and pump diagnosis.

If the charging system is good but the battery drains, a parasitic draw (such as a stuck relay or module staying on) is the issue. Suspension, fluid, and ignition components are unrelated. ASE G1 stresses current draw testing.