hi guys, ive got a lifted 2000 1500 sierra with a built 4.8l and 5peed with a 9.5 14bolt rear about three weeks ago i dropped my second gear in my NV3500, its my second tranny and was seeing if and what would be needed for a NV4500 swap. I want the lower gears of the NV4500 and the reliability. any knowledge would help.