S15/T15 Sonoma P/U 2WD V6-4.3L VIN X (1998)
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Porous casting
Leak at the Torque Converter End
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Converter leak in the weld area
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Converter seal lip cut (check the converter hub for damage)
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Converter seal bushing moved forward and damaged
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Converter seal garter spring missing from the seal
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Porous casting of the transmission case or the oil pump
Leak at the Vent Pipe or the Fluid Fill Tube
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Overfilled system
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Water or coolant in the fluid (the fluid will appear milky)
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Transmission case porous
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Incorrect fluid level indicator
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Plugged vent
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Drain-back holes plugged
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Mispositioned oil pump to case gasket (if equipped)