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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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  #1  
Old 05-20-2012, 06:57 PM
1969furd 1969furd is offline
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gear change

i have a 07 f150 getting 17 mpg in town, i would like to get 20 MPG in town, this is a 5 speed, i do not shift into 5th gear. max in town in 40 MPH. i have 3.55 i was wondering would 3.27 getting me to that 20 MPG?
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Old 05-20-2012, 07:06 PM
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17 mpg is a good number for a pickup, and shifting into 5th will probably help your numbers.
As far as the gear change goes, have you priced it out yet? last I knew it was $1500++
That is a lot of fuel.how many miles are you going to have to drive before you actually start saving $?
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Old 05-20-2012, 07:12 PM
1969furd 1969furd is offline
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not yet, i have tried 5th in town and it ust bogs the eninge down
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money pit (work in progress)
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Old 05-20-2012, 07:34 PM
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After I asked you those questions I ran some numbers.

I figured 15,000 miles in a year. And currently 87 octane down the street is $3.87

15,000 miles/ 17 mpg = 882 gallons annually for a grand total of $3413.34
Now 15,000 miles/ 20 mpg = 750 gallons annually for a grand total of $2902.50

That will end up being a savings of $510, so you will not see any savings for about 3 years if my price on a gear change and estimated miles per year are accurate
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Old 05-20-2012, 07:45 PM
1969furd 1969furd is offline
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still ot bad, i hav this truck on paymens for the next 4 years and that ins and extra few bucks i can throw at payments to get it paid off faster. Now next quetions can i get a set of 3.23 for my axle?
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Old 05-20-2012, 07:56 PM
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That part I'm not sure about. Everyone else I have seen went with taller gears r to accommodate bigger tires. Also I didn't see if your truck is 4x4 but if it is you will need to change both sets of gears
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Old 05-20-2012, 07:59 PM
1969furd 1969furd is offline
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ok i did some reserach i can get a set of 3.31 for just undr 500 bucks (oem)
\or i can get aftermarket high perf 3.31 for just over 300
Aftermartket 3.31 High performance Yukon Ring & Pinion gear set for Ford 9.75" in a 3.31 ratio - YG F9.75-331

oh it is a 2wd so i only have to change one set, going to call on mondya and see what install would cost
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Old 05-20-2012, 08:11 PM
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Good luck, maybe someone else can do the math for potential mpg gains with that gear set.
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Old 05-20-2012, 08:23 PM
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Lets hope so. A question is free and non commital
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Old 05-21-2012, 08:23 PM
1969furd 1969furd is offline
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the 3.31 gear set would drop my RPM by 150, not worht the 600 bucks to do the job
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1972 International Harvester
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money pit (work in progress)
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Old 05-21-2012, 09:49 PM
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Do they make smaller gears for your Axel? Or you could get skinnier tires to help the mpg
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Old 05-21-2012, 09:51 PM
1969furd 1969furd is offline
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smaller????? the owest numercaly i can get is 3.08 and i think i cna go max of 3.73
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  #13  
Old 05-22-2012, 06:15 PM
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Wouldn't shifting into 5th basically do the same thing, all either will do is lower the rpm's
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  #14  
Old 05-22-2012, 06:19 PM
1969furd 1969furd is offline
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5th gear makes my ening bog intown,and i know that is bad for milage as well. For th skinnier talller tire what would be a good size. I would like to stay with a 17 inch max. If there is a way of going to a 16 inch tire that would be great.
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1972 International Harvester
10 speed Roadranger
Cat 3116 Diesel
money pit (work in progress)
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Old 05-22-2012, 10:24 PM
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[QUOTE=SCRWDRVR;11864625]Wouldn't shifting into 5th basically do the same thing, all either will do is lower the rpm's[/QUOTE What he said changing gears or taller tires are going to do the same thing as shifting to 5th. You are probably at your Max MPG.
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Old 05-22-2012, 10:24 PM
 
 
 
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