Towing with 37's - Ford Powerstroke Diesel Forum
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Old 08-15-2011, 11:04 AM
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Towing with 37's

I recently upgraded from 32's to 37's and have noticed it requires a lot more for me to get rolling from a stop. I have the 6-speed and even without towing anything, I always find myself starting off in low instead of 1st now as it seems to bog down a good bit unless I slip the clutch to get rolling.

On top of that, towing my 17.5' bass boat in 4th seems to be about the best gear for me. I don't find myself wanting to go in to 5th until 65mph or so as it seems like there is just too much of a load.

Is this where I'm told to deal with it or get a different rear end? Thanks.
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Old 08-15-2011, 11:56 AM
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wow.. i'd throw some gears under there for sure.. 37's? im gonna take an educated guess and say 4.30's are about right for ya. im sure someonee else will chime in.
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Old 08-15-2011, 12:17 PM
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Gears or HP is whats needed, best both....4.10 or 4.3's with a chip or stage 1's will get the job done.
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Old 08-15-2011, 12:31 PM
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I'll check the sticker tonight to see what I currently have (guessing 3.73's??). Either way, being 4x4 the front and rear would need replaced correct? It's probably cheaper to just lower the truck and get smaller tires. I didn't realize it would be this bad or I would have limited myself to 35's.
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Old 08-15-2011, 12:33 PM
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I don't have a chip, but I do have the Flashpaq that is set of "performance" which I believe is their highest HP setting.
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Old 08-15-2011, 05:13 PM
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3.73 on 31.5 (stock) equals nearly exactly the same ratio as 37s with 4.56. 4.30s would be a good mix of cruising and towing. Want stock ratio, need 4.56
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Old 08-21-2011, 08:28 AM
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I have 4.56 and 37s. It is a perfect combination. 4.10 and 4.30 just aren't worth the money as there won't be much of a difference. I tow a lot so it works perfect for me as I can tow in overdrive most of the time.
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