So I already own a hydraulic AOD. I bought it for $40, it’s in my garage. C4 column shift is in the rig. 33’ tires ( measure 31.5”) 4.5 gears. I have a local seller of a core 4r70w off 2005 f150. Hoping to get for less than $100. Trying to get an overdrive tranny with best gear ratios and OD drum/ band combo in the $1200 range. Plan on rebuilding myself, where am I potentially going wrong here.