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Old 02-18-2011, 11:46   #1 (permalink)
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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
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Old 02-18-2011, 15:49   #2 (permalink)
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Re: Ring and Pinion Swap

My '00 non-PI with the 2.73 gears averages 26-27mpg on the highway,with stock tires. I drive a little slower, usually about 68. I'd think you'd find 2.47 a little too steep...it might end up hunting gears on grades.
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Old 02-18-2011, 17:18   #3 (permalink)
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Re: Ring and Pinion Swap

Quote:
I only get appx 20mpg at 70mph with little to no wind. Our octane ratings here are 85.5, 87,91.
Ok, this is my 1st 4.6 vehicle but I have customers with 4.6 Thunderbirds and 4.6 Towncars and we all get about 25-26 Hywy on 87 gas going 75 MPH.even with 4 adults and a trunk full of suitcases.
Again,I have limited experience but I still think I would check the usual suspects for the crappy mileage,ie. air filter,Mass Air dirty, low tire press.,worn plugs,etc.
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Old 02-18-2011, 22:08   #4 (permalink)
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Re: Ring and Pinion Swap

Air meter is new. Sparl plugs are less than 20k old. Motorcraft platnium. fuel and air filters are new. It is on fleet maintence schedule. I have seen some police testing reports saying 17 city up to 22 highway with the 3.27 not sure if its cause of the added suspension or maybe weight of gear cage etc.
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Old 02-24-2011, 03:42   #5 (permalink)
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Re: Ring and Pinion Swap

Here are some RPM charts for various gear ratios and 225/60/16 tires @ 70mph

3.27-2022
2.73-1688
3.55-2195
3.08-1904
2.47-1527

Could the 334 rpms make a difference in that amount of fuel mileage between a 3.27 and 2.73?I am also at 3900ft in elevation as well.
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Old 02-24-2011, 08:26   #6 (permalink)
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Re: Ring and Pinion Swap

It's only 388 RPM but that is a 20% difference. Overdrive 4th. is a 30% difference from 3rd.gear. The running condition of your car, the terrain and the speed you drive (and other driving habits) probably would make the most difference. 3900 ft. is not way up there and I'd think the ECM would be pretty much able to compensate for changes.

IIRC, in an old thread on MPG, Bert reported mileage with his CVPI was within about 2 MPG of what I got with my non-PI (w/a 2.73 gear).
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Old 02-24-2011, 19:45   #7 (permalink)
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Re: Ring and Pinion Swap

Look up the (Rear Bumper Tuck Mod) in your explorer.Basicly you remove the old retaining brackets on the rear bumper that hold the middle from ballooning or they are torm away or missing. Use 2 large or 4 small plastic ty raps and pull the bottom Middle of the rear bumper up as close to the frame and secure the bottom as close to the rear frame as you can. You may have too drill two holes for tydowns if the old holes are torn away on the bottom lip of the bumper. This trick stops the air from balloning the rear bumper and helps gas milage. Check all tire air pressure is eqaul at 39 too 42lbs in all four tires. My best mileage with a 2005 cvpi and my 2009 cvpi is running at 42 lbs in all four tires. Dont do a rear gear swap down to 273s because this transmissions are electrically shifted by the (PCM)computer and this change may cause your car to shift eratically and you will end up with the car hunting for gears. If you do the gear swap you will need a PCM tuner and reset the shift perimeters for that 273 gear set. NO a civillian PCM will not work.
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