4.10 or 4.30 gear - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 06-29-2007, 05:39 PM Thread Starter
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4.10 or 4.30 gear

I need some advice. I have a 03 F-250 6.0 4x4 with 6 spd. It has a 4in exhaust and hypertech power module. I have stock 3.73 gears. i pull about 14,000 lbs on a goose neck and would like some more low end torque for pulling. Would the 4.10 be good enough or do I need to step it up to a 4.30? Any advice would be helpful Thanks.
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post #2 of 10 Old 06-29-2007, 05:43 PM
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For no more than 14,000 lbs in tow, 4.10 should be plenty. The 4.30 is going to be a little less friendly for daily driving or highway driving. Especially with a 6 speed, the 4.10 should be plenty unless you tow that much weight in the mountains nearly every day.
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post #3 of 10 Old 06-29-2007, 05:55 PM Thread Starter
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Most my pulling is in some flat land with moderate hills. The 3.73 is just to slugish for me on take off. I want low end torque, not high end speed. Tanks for your reply.
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post #4 of 10 Old 06-29-2007, 06:13 PM
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I'm not talking about high end speed but rather fuel economy differences. The 4.30 of going to put you upwards of 2400 to 2500 rpm at 70 mph. Your best fuel economy will be at 1900 to 2000 rpm which will likely be around 60 mph or less.
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post #5 of 10 Old 06-29-2007, 10:37 PM
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id stay with the 3.73. 4.10's will treat you alright..but rememer that if your truck is a 4x4 you cant just regear one axle...u need to to do them both, but you will sacrafise fuel economy each gear increment you go up. If you go to a 4.30, your top speed will probably be 70-80MPH before you hit redline ...just things to consider...the fuel economy loss is gonna be pretty drastic between a 3.73 and a 4.10 at any speed over about 55
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post #6 of 10 Old 06-30-2007, 08:18 PM
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How often do you pull 14,000#??? If its at least twice a week then I would say go for the 4.10's. If it is like twice a month then just keep the 3.73's and get more power.

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post #7 of 10 Old 07-01-2007, 07:31 AM
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I just use low gear to start off when towing heavy. 35s with 3.73 and 6spd. 1st is too tall sometimes

2004 F-350, 4x4, SC, LB, 6.0PSD, 6spd
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post #8 of 10 Old 07-01-2007, 07:37 AM
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4.10's with 35's and 4:30 with 37-38's. yup you have to change both axles and will need carriers if you go to 4:30's. 410's should run about 13-14 hundred bux. and 1600 with carriers
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post #9 of 10 Old 07-01-2007, 09:55 AM
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For the cost of regearing 2 differentials, for needing a bit more power occasionally, I would seriously consider a Gear Vendor over/under drive unit. Will run in the $2500 neighborhood, but then you'll have the power when you need it and the fuel economy when you don't.

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post #10 of 10 Old 07-03-2007, 05:47 PM
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Hey Man,
Just a word from Down Under in Oz, where we tow Bushtracker vans for a living.. Which are not heavy as a big one will only go about 8000-9000 lbs.. But I tow some other heavy things, tri-axle loaded trailers and such... Go the 410s.... That is what is in my F-350 KR CC LWB 4x4...

The 430s will kill you on fuel... The 410's are plenty adequate, you just do not need to go higher unless you were towing a 35' gooseneck delivery van for a living or something... I am running right on 2000 rpm at 100 km per hour... Any RPM over cuts into fuel economy.. An F-450 running 430's is not happy. Too Extreme, the 410's seem right....! Would do them again...

And the Tow/Haul mode on the autos is awesome is you do a really big job..

Regards from Oz, out on the last frontier, still working horses...
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