Automatic Transmission Fluid Leaks

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Causes
Torque Converter (1)	Inspect for damage, cracks at the lug, hub and seal welds.
Automatic Transmission Fluid Pump Seal (5)	Inspect for cut, wear, or damage.
A/Trans Case Assembly (16)	Inspect for porosity or damage. Inspect manual shaft seal. Inspect control wiring input sleeve seals.
A/Trans Case Extension Assembly (22)	Verify oil is from transmission and not transfer case assembly (4WD/AWD). Inspect extension seal assembly (inner seal behind boot - 2WD only). Inspect extension to case seal (2WD only).
A/Trans Fluid Pan (49)	Inspect the pan assembly for damage. Inspect gasket for damage or wear. Inspect case and pan for damage and flatness at gasket interface area.
Cooler Lines/Coolers	Inspect and follow cooler lines to front radiator and external coolers. Some vehicles may have rear differential external and internal coolers.