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3. Today's automatic overdrive transmissions offer gear ratio spreads that are perfect for a truck that will see more time on the highway than the dragstrip. Gearstar specializes in building hi-po versions of these trannys that will stand up to anything I plan on dishing out through motor mods. The factory 4l65-E designation (4=four-speed, L=rear-wheel-drive, 65=torque capacity, E=electronic) goes right out the window after Gearstar gets its hands on the trans. This level 4 tranny will take full throttle blasts from a dead stop and not break even with more than 600 lb-ft running through the 10-inch 2,600-rpm stall converter. Out on the highway, cruising economy will be enhanced thanks to 3.06 First gear, 1.62 Second gear, 1.0 Third gear, .070 Fourth gear ratios, and a lockup converter that will give the trans a 1:1 ratio after 50 mph.