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'11-Up Gas Engines Discussion of the gas engines available in the 2011-Up Super Duty trucks

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Old 10-09-2010, 07:59 AM   #1 (permalink)
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Axle Ratio - 3.73 or 4.30

I'm thinking about purchasing a 2011 6.2 F250 and want some input on axle ratios. The truck will be primarily used for commuting and household chores such as Home Depot runs. I might tow a 5,000 # trailer one a year. I plan on eaither leveling with 33"s or possibly installing a 4" lift with 35's. I know the 4.30's would be better for the 35" tires but are they neccessary? Every truck I see on lots around here have 3.73's. Would the 3.73's MPG suffer with the 35's? Any input would be appreciated.
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Old 10-09-2010, 11:28 AM   #2 (permalink)
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I would probably go with the 4.30s if you plan on larger tires AND towing, but what is the stock tire size? (as i have no idea) There are times when i wish my truck had 4.10s. But i do think you could probably live with the 3.73s with no problem tho, esp if you pulled mostly highway driving. Stop and go might get thirsty.
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Old 10-09-2010, 11:37 AM   #3 (permalink)
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Since the mileage with the 3.73s will not be hugely better than the 4.30s, and considering you plan to eventually add larger diameter tires, I myself would go with the 4.30s. You'll probably have to order it as most dealers spec the 3.73s on their stock units. As far as stop and go mileage, I would think that the 4.30 ratio would be a wash as the engine would not have to work as hard to get the beast moving.
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Old 10-09-2010, 09:20 PM   #4 (permalink)
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Quote:
Originally Posted by hedgehog View Post
I'm thinking about purchasing a 2011 6.2 F250 and want some input on axle ratios. The truck will be primarily used for commuting and household chores such as Home Depot runs. I might tow a 5,000 # trailer one a year. I plan on eaither leveling with 33"s or possibly installing a 4" lift with 35's. I know the 4.30's would be better for the 35" tires but are they neccessary? Every truck I see on lots around here have 3.73's. Would the 3.73's MPG suffer with the 35's? Any input would be appreciated.
With what you've described, you'll be better with 4.30's.
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Old 10-10-2010, 04:00 PM   #5 (permalink)
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35"s are only 1" taller than the stock 20s. You can also fit 35s on a stock non-lifted truck. If I were to get a 4" lift i'd get 37s and 4.30s but stock height allows for a harder working truck and is how I keep mine.
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Old 10-10-2010, 05:37 PM   #6 (permalink)
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From what I've read, the 4.30's don't really change the mileage worth speaking because the engine is working less - and that's just driving. I'm looking at the 6.2L and will consider the 4.30 first. It seems the new 6-speed is much better with the 4.30's than the last generation trannys.
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Old 10-10-2010, 07:02 PM   #7 (permalink)
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35"s are only 1" taller than the stock 20s. You can also fit 35s on a stock non-lifted truck. If I were to get a 4" lift i'd get 37s and 4.30s but stock height allows for a harder working truck and is how I keep mine.
20"s are not avail on 6.2L equipped trucks. I believe the stock tire height is 32.5 or so inches.
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Old 10-17-2010, 08:53 AM   #8 (permalink)
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Originally Posted by hedgehog View Post
I'm thinking about purchasing a 2011 6.2 F250 and want some input on axle ratios. The truck will be primarily used for commuting and household chores such as Home Depot runs. I might tow a 5,000 # trailer one a year. I plan on eaither leveling with 33"s or possibly installing a 4" lift with 35's. I know the 4.30's would be better for the 35" tires but are they neccessary? Every truck I see on lots around here have 3.73's. Would the 3.73's MPG suffer with the 35's? Any input would be appreciated.

I have the 4.30's and am glad I ordered it that way. (I didn't see any 4.30's on the lot)

My machine doesn't see highway driving much, but I do tow with it and I have had a low of 12.2 mpgs and a high in ther 14's (on a tankfull) so I don't think you give up much to the 3.73's. And ther 4.30's are better on the go when towing.

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Old 10-18-2010, 07:03 PM   #9 (permalink)
 
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3.73 no question..that motor has max tq so low 4.3's will just burn the tires off..5k tow...ya won't know its behind you..you will REGRET 4.3's.
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Old 10-18-2010, 08:27 PM   #10 (permalink)
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I love my 3.73, unless you are towing all the time i would go with the 3:73's
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Old 10-19-2010, 05:11 AM   #11 (permalink)
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3.73 no question...you will REGRET 4.3's.
Dude, "REGRET" might be a bit strong. Have you had one with that ratio?
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Old 10-19-2010, 04:16 PM   #12 (permalink)
 
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Ya know I made a bigtime mistake and I'll retract my post as I didn't see this was about a Gas motor..sorry to all.

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We only carry the BEST parts and never compromise just to get a sale.

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Old 10-19-2010, 04:32 PM   #13 (permalink)
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I have 3.73's. Works really well for me. I tow maybe 12-15 times a year. If I towed all the time; 4.30's would be a better way to go. For those who will never tow or just tow every once in a while; the 3.73's are better. For those who do alot of highway driving without towing; the 3.73's are better also.
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Old 10-19-2010, 08:14 PM   #14 (permalink)
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Quote:
Originally Posted by Front Runner View Post
I have 3.73's. Works really well for me. I tow maybe 12-15 times a year. If I towed all the time; 4.30's would be a better way to go. For those who will never tow or just tow every once in a while; the 3.73's are better. For those who do alot of highway driving without towing; the 3.73's are better also.

Agree
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Old 10-20-2010, 10:34 PM   #15 (permalink)
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How will 3.73's be with 35" tires?
Like I said, I will probably only tow 5,000# trailer once a year
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