TH350 Deep Aluminum Pan

The TH350 Deep Aluminum Pan from Transmission Specialties is a finned deep-sump transmission pan engineered for TH350 automatic transmissions. This aluminum construction replaces the factory pan while adding nearly two additional quarts of fluid capacity, delivering superior heat dissipation and extended fluid life during high-demand driving conditions.

The deep-sump design increases transmission fluid volume, which translates directly to cooler operating temperatures and reduced thermal stress on the fluid and internal components. The finned aluminum construction maximizes surface area for heat transfer—critical during sustained high-load scenarios like towing, performance driving, or off-road recovery operations. At 8.13 pounds, the natural aluminum finish resists corrosion while maintaining a clean appearance. The pan's dimensions (13.7 x 4.6 x 13.8 inches) fit within standard TH350 installations without modification.

This upgrade addresses a common wear accelerant in stock TH350 transmissions: elevated fluid temperatures. Mechanics and builders installing this pan typically pair it with an external cooler for maximum thermal management. It suits classic car restoration, street rod builds, truck modifications, and any application where the transmission encounters sustained load or elevated ambient temperatures. The deep sump also reduces the risk of transmission starvation during aggressive acceleration or cornering, where stock shallow pans can temporarily expose the pickup tube.

TH350 transmission pans are available in various depths and materials—cast iron, stamped steel, and aluminum. The aluminum finned deep-sump design strikes a balance between weight reduction and thermal performance, making it favored for both street and performance applications where every degree of fluid temperature matters.