Automatic Transmission Shift Kits

Shift Kit, Performance, Gaskets, Pro-Race, Heavy Duty, Super Show Off, Buick, Cadillac, Chevy, GMC, Oldsmobile, Pontiac, TH400, Kit

Part Number: TRG-400-PRO

4.95 out of 5 stars ( 21 )

Estimated Ship Date: Today

• Free Shipping

Shift Kit, Performance, Buick, Chevy, Oldsmobile, Pontiac, GMC, TH400, 1965-95, Kit

Part Number: TRG-400-1-2

4.76 out of 5 stars ( 21 )

Estimated Ship Date: Today

Transmission Upgrade Kit, Shift Improver, GM, TH400, TH375, TH475, Each

Part Number: BMM-20260

4.81 out of 5 stars ( 16 )

Estimated Ship Date: Today

Shift Kit, Performance, Full Manual or Automatic Capability, Buick, Chevy, Oldsmobile, Pontiac, GMC, TH400

Part Number: TRG-400-3

4.17 out of 5 stars ( 6 )

Estimated Ship Date: Today

Transmission Upgrade Kit, Transpak, GM, TH400, TH375, M40, Each

Part Number: BMM-20228

3.67 out of 5 stars ( 3 )

Estimated Ship Date: Today

• Free Shipping

Automatic Shift Kit, THM400, Buick, Chevrolet, GMC, Oldsmobile, Pontiac, Car, Kit

Part Number: TRG-SK400

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

Transmission Upgrade Kit, Shift Improver, GM, TH400, TH475, Each

Part Number: BMM-20261

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Today

Shift Kit, Filter, Gaskets, for TH350 or TH350C, Buick, Cadillac, Chevy, GMC, Oldsmobile, Pontiac, Kit

Part Number: ATP-SK1

Not Yet Reviewed

• Special Order

Transmission Upgrade Kit, Trans-Scat, Buick, Chevy, Oldsmobile, Pontiac, TH400, Each

Part Number: TCI-400000

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

• Drop Ship
• Special Order

Transmission Upgrade Kit, Valve Body Performance Improver, GM, TH400, Kit

Part Number: TCI-226000

Not Yet Reviewed

Estimated Ship Date: Dec 7, 2026 if ordered today

• Drop Ship
• Special Order

ATP Automatic Transmission Upgrade Kit

Part Number: ATP-JK1

Not Yet Reviewed

Estimated Ship Date: Nov 3, 2026 if ordered today

• Drop Ship
• Special Order

ATP Automatic Transmission Upgrade Kit

Part Number: ATP-SK2

Not Yet Reviewed

Estimated Ship Date: Nov 3, 2026 if ordered today

• Drop Ship
• Special Order

VALVE BODY KIT

Part Number: PIO-765007

Not Yet Reviewed

Estimated Ship Date: Nov 9, 2026 if ordered today

• Drop Ship
• Special Order

VALVE BODY KIT

Part Number: PIO-765010

Not Yet Reviewed

Estimated Ship Date: Nov 9, 2026 if ordered today

• Drop Ship
• Special Order

VALVE BODY KIT

Part Number: PIO-765003

Not Yet Reviewed

• Free Shipping
• Special Order

VALVE BODY KIT

Part Number: PIO-765023

Not Yet Reviewed

• Free Shipping
• Special Order