Hi all. Thinking of changing my rear 273 gears to 342,s, an was wondering who out there has done this modification, and what is all involved to do it, and roughly the cost. I have read the difference is light night and day . It's an automatic, and mainly street driven, no racing, but I do love torque, and realize it will affect my gas mileage a bit, and who in the Niagara area would be the best shop to take it too?