3.73 or 4.30? - Ford Powerstroke Diesel Forum
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post #1 of 24 Old 11-29-2013, 11:31 AM Thread Starter
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3.73 or 4.30?

So,

I have done the research on wether or not to regear my Superduty. Everyone seems to have their own opinions and how they ran 4.30's and said it was the best thing they did for the truck. While others say stick with the 3.73s. And 4.10s don't seem to make much of a change.

I do a majority of highway driving at 70mph and it cruises awesome I THINK at around 2000rpm. I hear it is very easy to overgear a diesel and I seldom tow except for the once-a-year tractor for the property and a boat during the summer. I plan on doing meth-injection as well this month so I will have more power so to speak. The tranny is built with a torque converter and deep pan and tranny cooler as well.

Any advice would be appreciated!



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post #2 of 24 Old 11-29-2013, 11:39 AM
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Had the 4:56's in mine and absolutely loved/miss them. Converted to a dually went to 4:88's for pullin. Econo crashed never bought my 45' WW and maybe one day regear or get a Gear vendors OD

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post #3 of 24 Old 11-29-2013, 12:11 PM
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Running 3.73s and have no issues at all. Truck runs great on the highway and cruises easily at 70-75.

'03 7.3 - Stock!

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post #4 of 24 Old 11-29-2013, 12:29 PM
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My OBS was 410s. Way too high geared. My SD is great with 3.73s and 35s, 200rpm at 75 mph. UNless it's purpose built, stick with the 3.73s.

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post #5 of 24 Old 11-29-2013, 01:04 PM Thread Starter
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Quote:
Originally Posted by Gaius View Post
My OBS was 410s. Way too high geared. My SD is great with 3.73s and 35s, 200rpm at 75 mph. UNless it's purpose built, stick with the 3.73s.
Purpose built as in for towing only? The purpose of this rig is everyday use I suppose. And throwing down occasionaly. lol



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post #6 of 24 Old 11-29-2013, 01:28 PM
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Like my 3.73's and i tow often. only about 6K lbs but i never have any issues although i do have a 6 speed and can control my shifting and power.

I wouldn't go any lower than 4:10's unless your really worried bout your 0-60 towing times.

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post #7 of 24 Old 11-29-2013, 01:50 PM
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The sweet spot on a 7.3 is 2000rpms...if you do a lot of highway driving youll get best mileage holding 2000 RPM all day.

If you are mostly city you'll get some more pep and better towing going to 4.30's but your highway mileage will suffer as you would be up around 2300 where you would be at 2000 before.

I may re gear because at 90km/h in 4th gear I'm at 2000rpm... I don't even get into 5th unless i"m on a major highway

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post #8 of 24 Old 11-29-2013, 04:17 PM
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I know it's not quite the same, but this summer I put a set of 33" tires I had lying around on my truck for a couple months.
I cannot begin to tell you how much I HATED it.
I much prefer the lower rpm characteristics of my 35's. I've never had 37's though so I can't really say for sure about that one.

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I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #9 of 24 Old 11-29-2013, 06:15 PM
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Originally Posted by Lambo3244 View Post
Purpose built as in for towing only? The purpose of this rig is everyday use I suppose. And throwing down occasionaly. lol
No, like built for drag racing or sled pulling. Or solely built to tow large loads up and down the Rockies. Then I'd want higher gears.

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post #10 of 24 Old 11-29-2013, 07:03 PM
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Quote:
Originally Posted by Joel View Post
I know it's not quite the same, but this summer I put a set of 33" tires I had lying around on my truck for a couple months.
I cannot begin to tell you how much I HATED it.
I much prefer the lower rpm characteristics of my 35's. I've never had 37's though so I can't really say for sure about that one.
When I was auto with 37's and 3.73's I hated it. The tranny never knew what to do. Once I got a chip it was 100x better though just raised all the shift points and it felt normal then

Please check out my 7.3 Enthusiast Facebook group! All are welcome! LINKY

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