For 1990-2009 cars

Once the leak has been pinpointed and traced to its source, the cause of the leak must be determined for it to be properly repaired. For example, if a case component is resealed but the mating surface is damaged, resealing will not repair the leak. The damaged mating surface must be repaired or replaced. Before attempting to repair a leak, certain conditions should be checked for and corrected if necessary. The following conditions may cause a transmission oil leak.

| Important: The Suzuki 5-speed manual transmission does not use gaskets to seal major case components. GM P/N 12346240 (Canadian P/N 10953493), or equivalent, should be used where applicable.

• | The oil level is too high.

• | A plugged breather vent.

• | Improperly torqued fasteners, dirty or damaged threads.

• | Warped flanges or mating surfaces.

• | Scratches, burrs or other damage to mating surfaces.

• | Insufficient or excessive amounts of sealer.

• | Cracking or porosity of the cases.

• | Improper sealant used where applicable.

• | Damaged seal bore.

• | Damaged or worn seal.

• | Scratched, nicked or damaged propeller shaft surfaces.

• | Loose or worn bearing causing excessive seal wear.