430 or 456 gears - Ford Powerstroke Diesel Forum
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post #1 of 26 Old 02-21-2013, 12:21 PM Thread Starter
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430 or 456 gears

any one running 37's with 430 or 456 gears whats the rpms
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post #2 of 26 Old 02-21-2013, 02:22 PM
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4.30 would put you closest to a 3.73 with stock tires. You would be about 2k RPM at 70MPH. If you plan on going larger, towing heavy or crawling at low speeds then go with the 4.56, otherwise the 4.30 would be perfect.

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post #3 of 26 Old 02-21-2013, 03:21 PM
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4.30s if you don't tow. If you tow often/heavy go 4.56. At 70 MPH, with 37s 4.56 would only be 100 RPM higher. With 4.30s, if you ever need to go back to stock, you could still DD it.

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post #4 of 26 Old 02-21-2013, 06:04 PM Thread Starter
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I dont tow much
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post #5 of 26 Old 02-21-2013, 07:29 PM
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Not to hack your post OP, but what would the has mileage be like with 4:30's running 35 or 37's?



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post #6 of 26 Old 02-21-2013, 07:54 PM
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Im running 37s and 4.56s and at 70 im right at 2k rpms, so its not too bad

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post #7 of 26 Old 02-23-2013, 08:03 PM Thread Starter
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Is the mpg with 430s and 37 close to the same as 373s and 31?
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post #8 of 26 Old 02-23-2013, 09:04 PM
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No. Not at all.

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post #9 of 26 Old 02-23-2013, 10:40 PM Thread Starter
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How much less is it
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post #10 of 26 Old 02-23-2013, 10:42 PM
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36.

The point being that size is a really small factor of the many things that regard mileage.

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