B&M ShiftPlus Electronic Shift Improver Kit GM 4L60E, 4L80E # BM70380B&M ShiftPlus Electronic Shift Improver Kit GM 4L60E, 4L80E # BM70380 "Shift Improver, ShiftPlus Electronic, GM 4L60E, 4L80E, Each BM ShiftPlus Electronic Shift Improver Kits BM's ShiftPlus electronic shift improvers use vacuums or electronics to improve the characteristics of your transmission, and let you change settings as you drive. Great for performance, towing, and RV use, these shift improvers recalibrate your transmission in one of two ways:
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