my junky 727 slips from 2-3rd.i havent had a 4 speed car since the 80s.want to switch over my 69 dart to 4 gear.has anyone used a brewers kit.i have a big block with aq 9 inch ford rearend.32x14 street tires,3.54 gear.traction bars,7 leaf springs.tubbed out with frame connectors