Are 4.30s to Low - Ford Powerstroke Diesel Forum
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Old 12-16-2012, 06:54 PM
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Are 4.30s to Low

I am thinking about regearing my truck from 3.73s to 4.30s (can get 4.30s done dirt cheap) but I am worried that they might be to low. I only use the truck for hauling my camper and sometimes the camper and the boat (Camper = 5,000lbs Boat = 4,000lbs). I use Erics tow tune and the truck does ok now but I think that lower gears would be better. I think 4.10s would be perfect but I can't the same deal as the 4.30s. Anyone that tows with 4.30s have any input about revs and fuel mileage.

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Old 12-16-2012, 10:00 PM
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I had an 05 a couple years ago with 37" tires and 4.30s. The gears (mph/shifting) were almost the exact same as stock (33s/3.73s), but a tad shorter. I personally think 4.30s on 35s or under would just be way too low. To each their own of course, but I would definitely try and get your hands on a set of 4.10s.
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Old 12-16-2012, 10:31 PM
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4.30"s are the gear ratio with the Tow Boss. I think you'd be happy you made the swap. 4.10 isn't enough change to justify the cost.
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Old 12-17-2012, 01:51 AM
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Quote:
Originally Posted by PGreenSVT View Post
4.30"s are the gear ratio with the Tow Boss. I think you'd be happy you made the swap. 4.10 isn't enough change to justify the cost.
Mitch beat me to it.
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Old 12-17-2012, 12:15 PM
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What speed do you like to drive/tow at? I have 4.10's with stock sized tires and it seems about perfect if you like driving/towing in the low 60's. The picture looks like you may have larger than stock tires. If they are, 4.30's might be a nice addition. If you have stock tires, I would personally shy away from 4.30's.
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Old 12-17-2012, 12:23 PM
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I don't use the truck as a DD but I do use it for some longer trips with the camper and boat. I know the 4.30s will make the truck pull alot better but I am worried that the higher revs running 65 or 70 will bothersome. I also am curious as to how it will affect my mileage, not that I get good mileage now ( 9 or 10 with camper and boat). I know that the revs will be higher but the truck should pull the load easier which should mean less boost and lower temps. Any thoughts?
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Old 12-17-2012, 12:41 PM
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I don't have any input, but I've been debating lower gears in my truck. If you don't mind me asking, how much would you be getting the 430s for and where from? If they are substantially cheaper than 410s I might switch.
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Old 12-17-2012, 12:42 PM
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If you like to run 70, I think it would be bothersome and expensive, but that's just my opinion. I would not want more than 4.10's with stock tires and have wondered if even they are a little too much for all but the heaviest tows. If you were towing a 15k 5'r that stuck 12' up in the air, I could see it. I'm towing a boat that is all of 12.5k and I don't need the any more than 4.10's to get the job done. Maybe you should try a different program and see if you get better results?
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Old 12-17-2012, 12:44 PM
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IF you are on a 33" tire, then you should be seeing about 1900 rpm at 70 right now on 3.73s. 4.10s would be at 2087 rpm, and if you go to a 4.30 gear, you should be seeing almost 2200 rpm at 70 mph.

To break it down to a percentage of change, 4.10s would only be a 9% change whereas 4.30s would be a 15% change. That 9% change isn't that big of a deal, that's what any of us saw when we went from the OEM tire to a 35. Albeit that was a loss not a gain. Anyway, if you're going to go through the effort of changing both sets for towing, I'd go with the 4.30 gear.

Last edited by Karls03; 12-17-2012 at 01:04 PM.
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Old 12-17-2012, 01:21 PM
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4.30s would be way too low for 65-70 with stock tires. Keep your 3.73s, you probably wouldn't notice much difference with 4.10s to be worth the swap. Also, it doesn't look like you ever tow that heavy, so power shouldn't be an issue. My dad's '03 is all stock with 3.73s and we've grossed a little over 30k towing over the mountain here several times.
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