TransGo Manual Shift Automatic Transmission Reprogramming Kit - GM 4L80E / 4L85E 1991-2013 TOTCRG4010-5 The "N" Series Ignitions feature

The "N" Series Ignitions feature the mandatory 6-Pin Weathertight connector to meet NASCAR's ignition wiring rule

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Ultra-High Ratio

Sold with valves only to allow for valve spring choices

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TransGo Manual Shift Automatic Transmission Reprogramming Kit - GM 4L80E / 4L85E 1991-2013 TOTCRG4010-5 The "N" Series Ignitions featureThis TransGo Reprogramming Kit provides full manual control for upshifting and downshifting 1st through 4th gear, there are no automatic shift functions retained. This kit delivers short firm shifts for performance as well as greater overall durability. It is designed for the off road driver only and for vehicles that do not have any TCM controls. It's all about providing the required gears when there are no computer controls. Similarly, the internal