433884 - GMC Chevy TH400 Transmission Polished, Finned Oil Pan Transmission Pan Material: Aluminum Transmission Pan Finish: Polished Transmission Pan Style: Stock Capacity Increase: None Drain Plug Included: Yes Filter Extension Included: No Filter Included: No Gaskets Included: Yes Bolts/Studs Included: Yes Temperature Sender Bung Included: No Notes: Finned. Stock depth. Cast from 356 aluminum, our Summit® transmission pans are stock capacity and utilize cooling fins for better heat dissipation. Some come complete with mounting bolts, a drain plug, gasket, filter (most applications), and filter extension.