Extreme quality boost bushing and valve.Corrects/Prevents/Reduces: High pressure parts breakage; has boost valve and pressure relief valve; direct clutch burnup; soft 2-3 slide-bang 1-2; low pressure due to solenoid filter breakup. Missing shifts with no diagnostic codes. 4L80E & 4L85E 91-08 GMC Yukon XL 5.3L, 5.7,6.6L, Hummer V-8, Chevrolet Suburban.

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