Ring and Pinion Swap
Ok, so I am new to the forum and I am pretty sure there may be a thread on this already but here it goes. I have a 2003 CVPI that is my work vehicle and I drive long distances between facilities that I must do work at. 80miles each way, 235miles each way, 406 miles each way, and so on. I also have the K9 Setup in the backseat for my dog. I only get appx 20mpg at 70mph with little to no wind. Our octane ratings here are 85.5, 87,91. She loves 93 octane, but its not gonna happen here. I do add lucas most of the time to help compensate. I currently have the 3.27 R&P in it. I know some 99-03 Crown Vics have 2.73s, 3.27s,and 3.55s. I know of some older 96s or so that have a 2.47 ring and pinion. Would it be possible to take a 2.47 out of one of those and place it in my 8.8 in my 03? It would sure help the facility I work for on fuel mileage. They want to switch me to a more economical and I dont want the whole hassle of a can car with a big dog. My CVPI does handle well in the snow though. The 03 only have 73,000miles on it and runs great and never had any issues. Any thoughts of the ring and pinion swap that it will help or hender? I know it will be slow as a ford fiesta off the start, but when I drive very little stop and go traffic I do not think its gonna matter. (the nearest city being 82 miles away) How much would the gas mileage approx go up. I did a RPM calculator and right now im turning around 2000-2100 at 70 with 225/60/16 tires. with the 2.73 it would drop to 1688 appx. and with a 2.47 it would be in the 1530rpm range. Would I advantage from this or loose all the power band? I deal with diesel engines mostly with different power bands. It does have an updated MAF system off an 05.
2003 CVPI 3.27 73k mi