QA1 63 Series Shock 9" Rear 5C/3R M30LCS Shift Improver Kit for TH-400

Shift Improver Kit for TH-400 (3L80) Automatic Transmission

can be cleaned after installation

180-200 MPH

and include sewn-in arm restraints

High Impedance Injector drivers power Holley EFI and most stock injectors - Injector support chart found in instructions (will not support low impedance injectors)

QA1 63 Series Shock 9" Rear 5C/3R M30LCS Shift Improver Kit for TH-400The 63 Series is a sealed non rebuildable version of the 62 Series. These are most commonly used in coil over applications on both dirt and asphalt tracks. The twin tube design gives excellent feel and grip across all track conditions, but they really shine when there is a lack of grip. Built as a spec shock that could be used at specific tracks or series, the 63 Series can be used in any late model or modified. QA1 specializes in high performance