superior shift kit 4l60e 4l65e 4l70eSuperior 4L60E L Shift Correction Kit (1998 Up) Code 1870 & TCC Fix Take control of your transmissions health with the Superior K4L60E L, the industrys most respected mechanical "Problem Solver." This isn't just a shift kit; its a comprehensive recalibration package designed specifically for 1998 and newer 4L60E, 4L65E, and 4L70E transmissions. Whether you're fighting the notorious P1870 slip code or looking to firm up "lazy" factory shifts in your
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