Two Pump Gear Sets For GM TH350 TH400 Transmission .727 Inch QK35201B

Two complete matched front pump gear sets for GM TH350, TH350C, TH400, and 3L80 automatic transmission repair and rebuild applications requiring .727-inch-thick gears.

This listing includes two gear sets. Each set consists of the matched pump gears needed for the applicable front-pump assembly. QK35201B is provided as a replacement and interchange reference for component matching.

Part Details

• Part type: Front pump gear sets

• Quantity: Two complete gear sets

• Transmission compatibility: GM TH350, TH350C, TH400, 3L80

• Gear thickness: Standard .727 inch

• Reference part number: QK35201B

• Application: Automatic transmission repair and rebuild

Fitment And Ordering Guidance

TH350 units were produced with multiple pump-gear thicknesses. Verify the transmission model, compare the original pump gears, and measure thickness before ordering. This listing is for the standard .727-inch-thick gear configuration and is not for oversized pump gears.

Competitor and catalog listings consistently identify .727-inch pump gear sets for TH350 and TH400/3L80 use, while also warning that TH350 gear thickness must be matched to the original component. Published application references commonly associate this thickness with 1969–1979 TH350 use and 1965–1998 TH400 use, but transmission identification and physical measurement remain the correct way to verify fitment.amazon+3

Rebuild Guidance

Install replacement pump gears only after the transmission has been properly diagnosed and disassembled for inspection. Check the pump body and cover for scoring, inspect the pump bushing and seal areas, and follow the service specifications for lubrication, assembly, clearance checks, and fastener torque.

Use the vehicle manufacturer’s specified automatic transmission fluid after service. If using Lubegard ATF Protectant, confirm compatibility with the application and use it according to the product directions.