Final drive ratio
Logistics Pro
Joined: May 2022
Posts: 4,293
Likes: 2,416
From: Everywhere and nowhere
so, if I put 4.56 gears in my truck with the 10spd I'll be doing like 2300rpm at 70mph in 10th gear. Gas mileage will be worse than my 460/zf5/4.10s with the same size tires.
Logistics Pro
Joined: May 2017
Posts: 3,523
Likes: 483
From: Southern OH
Are you asking me or telling me? Can't really compare two different trucks and drivetrains. An OBS weighs considerably less, and so do the OBS drivetrain components so you have less parasitic loss, not to mention it is a manual vs an auto. The efficiency of the 460 and 7.3 isn't the same either.
Cargo Master
Joined: Apr 2021
Posts: 2,590
Likes: 1,669
From: NW Wyoming USA
If Ford offered a gas SD with the diesel 3.31 gears with the 10 speed that has three overdrive gears.
Someone on here that had one would be tell us how great it is. Like they say in the car business, there’s an *** for every seat!
Someone on here that had one would be tell us how great it is. Like they say in the car business, there’s an *** for every seat!
Logistics Pro
Joined: May 2022
Posts: 4,293
Likes: 2,416
From: Everywhere and nowhere
Are you asking me or telling me? Can't really compare two different trucks and drivetrains. An OBS weighs considerably less, and so do the OBS drivetrain components so you have less parasitic loss, not to mention it is a manual vs an auto. The efficiency of the 460 and 7.3 isn't the same either.
The same argument about fuel economy with a supercharger always happens. People seem to think you are always needing 8psi of boost and you'll be turning 4k rpm. If you are making 50hp more at a lower rpm it could mean that you can tow at a lower rpm meaning you can possibly run a higher gear in your transmission which could give you better fuel economy.
Never has running a higher rpm got me better fuel economy. Add in extra rotating mass and reduced aerodynamics of larger tires then lower gears which will increase my rpm no way I'm getting better fuel economy.
Logistics Pro
Joined: May 2021
Posts: 4,026
Likes: 2,341
You are insufferable. You realize that you are the mirror image of the posters you complain about....but it's OK because it's the 'side' you are on?
Why are you so triggered about this? You are cheerleading 3.73/3.55 much harder than anyone has ever praised 4.30's, but you can't see it because of your bias. Why do you promote less power to the wheels so intensely?
Why are you so triggered about this? You are cheerleading 3.73/3.55 much harder than anyone has ever praised 4.30's, but you can't see it because of your bias. Why do you promote less power to the wheels so intensely?
The fact that so many 4.30 owners insist there is little or no difference to 4.30 compared to taller gearing for all situations runs contrary to industry understanding of drivetrain design.
Y'all missed your calling working as transmission engineers for one of the big three since you all seem so sure your way is the only way to go. Instead you are just a bunch bored people on the internet championing a cause that diesel owners chuckle at.
Logistics Pro
Joined: May 2017
Posts: 3,523
Likes: 483
From: Southern OH
I'm telling you. None of that crap matters when you're talking about raising the truck with taller tires and going to a lower gear. Lower gears do not get better fuel economy on the highway and higher gears don't get better fuel economy in the city. The overdrive in the 10R140 is higher than the ZF5 but turning 2000-2100RPM at 70mph when the fuel economy sweet spot on my engine and final drive is 1600-1700rpm. If I need more HP and TQ I only need to increase my RPM until I am making just enough to move my load either by downshifting or increasing speed in 10th gear. Sometimes in a wind I need to go 2300rpm to tow my trailer. On flat ground no wind I can tow in 10th gear at 70mph or 2000rpm. In California I could tow 1700-1800rpm and my fuel economy increased at least 2mpg.
The same argument about fuel economy with a supercharger always happens. People seem to think you are always needing 8psi of boost and you'll be turning 4k rpm. If you are making 50hp more at a lower rpm it could mean that you can tow at a lower rpm meaning you can possibly run a higher gear in your transmission which could give you better fuel economy.
Never has running a higher rpm got me better fuel economy. Add in extra rotating mass and reduced aerodynamics of larger tires then lower gears which will increase my rpm no way I'm getting better fuel economy.
The same argument about fuel economy with a supercharger always happens. People seem to think you are always needing 8psi of boost and you'll be turning 4k rpm. If you are making 50hp more at a lower rpm it could mean that you can tow at a lower rpm meaning you can possibly run a higher gear in your transmission which could give you better fuel economy.
Never has running a higher rpm got me better fuel economy. Add in extra rotating mass and reduced aerodynamics of larger tires then lower gears which will increase my rpm no way I'm getting better fuel economy.
Thread Starter
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Laughing Gas
Joined: Mar 2024
Posts: 751
Likes: 310
From: SE Vermont, South Jersey
I guess I should have just kept my mouth shut. Didn't mean to stir a hornets nest.
I will be going with the 3.73 (with locker) UNLESS I decide to add the Tremor package, which only allows the 4.30...
I will be going with the 3.73 (with locker) UNLESS I decide to add the Tremor package, which only allows the 4.30...
Lead Driver
Joined: Jan 2002
Posts: 8,680
Likes: 4,792
From: Itinerant
3.73 will do what you want and then some without issue all day long.
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Cargo Master
Joined: Apr 2021
Posts: 2,590
Likes: 1,669
From: NW Wyoming USA
POST #3
I told you in post #3 “gears are a very sensitive topic on here”. It’s as if you’re attacking their baby.😂
Tuned
Joined: Nov 2023
Posts: 431
Likes: 247
If my choice of gears really bothers people then I have 2 words for them and it is not happy birthday.
Cargo Master
Joined: Jul 2011
Posts: 2,675
Likes: 979
From: Walpole, MA
No way man, you asked an honest question. Unfortunately, rear gearing is a hot topic. Not really sure why people get all worked up about the build spec of someone else's truck but most of those threads end up like this unfortunately.
Tuned
Joined: Aug 2012
Posts: 262
Likes: 72
From: SW Cook County, Illinois
Thank you for a great Saturday morning, and entertaining read! It’s always good to have a choice!
Logistics Pro
Joined: May 2017
Posts: 3,523
Likes: 483
From: Southern OH
I would go with the 4.30s, a 4.30 geared truck pulls and drives much better.
Mountain Pass
Joined: Jan 2024
Posts: 144
Likes: 46