Couple Questions about re-gearing - Ford Powerstroke Diesel Forum
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Old 02-09-2012, 08:20 PM
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Couple Questions about re-gearing

So first off, I got an 01 F350 4x4 auto 7.3l. Its got a 5.5" lift on 35s (other mods in my sig). I don't know if the previous owner ever re-geared the truck to compensate for the lift and tires (but more then likely he did not). So I'm wondering what size gears I should put in. Its currently running the stock 3.73s (if it hasn't been re-geared) and I want different gears in it for optimum mpg. I don't tow with it, and I do more city/stop and go than highway driving(maybe 4 or 5, 600 mile round trips per year). I was thinking of 4.10s or 4.30s. Which would you guys suggest? I think that 4.56s would be too big for it and the type of driving I do. Which would be more ideal for the best mpg? Also, what name brands are better or the best to get? I don't want to spend boocoo bucks on them, but I don't want the cheap crap. Any good places to order them from? And what exactly would I need to order when I finally do order them? (not very good with axles and gears and what to get or not get. ). Any and all input is appreciated and thanked. Thanks in advance!!
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Old 02-09-2012, 08:28 PM
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I think with 35s you should leave it alone. I have 35s, and wouldn't want to regear unless I was towing really heavy all the time.
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Old 02-09-2012, 08:57 PM
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Quote:
Originally Posted by Zaairman View Post
I think with 35s you should leave it alone. I have 35s, and wouldn't want to regear unless I was towing really heavy all the time.
I second that. I have a 4" lift with 35s on my 2001 (3.73 gear) and I get around 18mpg highway. I may even get a little better mileage than that now that I installed an S&B intake and straight-piped it, but I havent checked it lately. I would suggest spending your money elsewhere.
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Old 02-09-2012, 09:09 PM
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Really? 18? is that hand calculated or by the lie-o-meter overhead? lol. In town I've been getting about 10.6-12mpg hand calculated. Granted i have lots of hills, stop and go, and I haven't had the lightest foot. Hopefully my TW chip (when it gets here) will help bump that up a bit. Does exhaust really help with mpg at all?

No go on the re-gearing tho?
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Old 02-09-2012, 09:19 PM
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18ish. Granted thats with a tuner and keeping it under 2,000 rpm with the cruise control on and flat road Florida driving. Hand calculated...my overhead lie-o-meter reads 12mpg, but it's way off. Not sure how much straight-piping affected it (if at all) because it already had a 4" turbo back exhaust with a straight-thru muffler when I got it, but I have noticed the intake and straight piping inreased throttle response dramatically, so Im assuming the more efficient air flow helped the mpg slightly too. Im not saying you shouldn't re-gear, I just dont think it's necessary.
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Old 02-09-2012, 09:19 PM
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Quote:
Originally Posted by E-Man View Post
I second that. I have a 4" lift with 35s on my 2001 (3.73 gear) and I get around 18mpg highway. I may even get a little better mileage than that now that I installed an S&B intake and straight-piped it, but I havent checked it lately. I would suggest spending your money elsewhere.
I find that kind of hard to believe. I have 33s and 3.73s with a 6 speed at 60 mph I have never seen over 13.9 MPG's.


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Old 02-09-2012, 09:27 PM
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Originally Posted by 01Crewcab7.3 View Post
I find that kind of hard to believe. I have 33s and 3.73s with a 6 speed at 60 mph I have never seen over 13.9 MPG's.


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I've only owned the truck since October, so maybe the previous owner did some other mods that I dont know about, but Im definetely getting better than 13.9 highway. I got around 15mpg last October while towing my wifes Altima behind it on a two wheel dolly, thats at around 65mph though (maybe I was going slower than I thought, lol).

Last edited by E-Man; 02-09-2012 at 09:34 PM.
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