4L60 4L60E 4L65E 4L70E Transmission 2.84 Input Carrier Kit The shift from 3.06 ratio (1st) to 1.63 ratio (2nd) is a dramatic ratio change, allowing engine RPM drop that results in performance engines falling out of the optimal power band. This 2.84 input carrier kit changes these popular units from a "wide ratio" 3.06/1.63 to a "close ratio" 2.84/1.55 Six-Pinion design with advanced durability features, Keeps engine in power band on 1-2 & 3-4 shifts, allows longer pull in 1st & 2nd gears