4.46 vs 4.7 Gear Ratio Discussion

[Jimmyleetennessee]

Kinda like changing tire size? Same, same. The computer doesn't care as long as everything is turning the same. My speedo/odometer is currently off by 9%. It's not a problem.

Changing tire size doesn't effect the rate at which sensors are spinning with regard to the ABS system. It's two completely different examples. Your speed sensor and ABS system must keep the same linear relation in order to function properly. Changing your tires makes the diff spin slower to maintain the same speed, it doesn't change the linear relation.

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[kodiakisland]

Changing tire size doesn't effect the rate as which sensors are spinning with regard to the ABS system. It's two completely different examples. Your speed sensor and ABS system must keep the same linear relation in order to function properly. Changing your tires makes the diff spin slower to maintain the same speed, it doesn't change the linear relation.

It's simple enough to reprogram if needed, so it's really not an issue. People regear all the time. It will be fine.

 

[Jimmyleetennessee]

It's simple enough to reprogram if needed, so it's really not an issue. People regear all the time. It will be fine.

Yes they do, and often times it has a permanent ABS light. Hopefully this will not be the case with the bronco, since they know people will heavily modify them! Haha

 

[kodiakisland]

Yes they do, and often times it has a permanent ABS light. Hopefully this will not be the case with the bronco, since they know people will heavily modify them! Haha

My Toyota and Chevy didn't have an issue when regeared, and I doubt the Bronco will either. Like I said, it's easy enough to reprogram if needed. It won't be an issue for me. If there is a permanent light on the dash, that's easy enough to deal with as well.

 

[SF Cowboy]

I'm going to swap out my Badlands 33's for 31's and when people snicker I'll just say I got big gears and I am under compensating

31's... come on guy's who's with me....

Crickets....

 

[Jimmyleetennessee]

My Toyota and Chevy didn't have an issue when regeared, and I doubt the Bronco will either. Like I said, it's easy enough to reprogram if needed. It won't be an issue for me. If there is a permanent light on the dash, that's easy enough to deal with as well.

What year were they? How much was the change? This new tech is an entirely different animal. The GOAT modes rely entirely on the correct inputs. Be curious to see when someone swaps how this is remedied.... for me 4.46 is PLENTY low enough haha my truck has a 3.55 and makes more than enough torque!

 

[kodiakisland]

What year were they? How much was the change? This new tech is an entirely different animal. The GOAT modes rely entirely on the correct inputs. Be curious to see when someone swaps how this is remedied.... for me 4.46 is PLENTY low enough haha my truck has a 3.55 and makes more than enough torque!

The bigger issue right now is getting the programming for the axle swap with FAD delete to work. The axle will come with 4.88s and the programing should be handled at the same time.

 

[Saw4Fire]

**As pointed out by some replies, you CAN get a manual badlands with the 4.7 ratio, but you do lose trail-turn assist.. which is why I didn't. I was strictly speaking of the automatic, I should have clarified.. although that is not at all the point of my post**
[/QUOTE]
The 4.7 ratio is standard on a manual non-Sasquatch Badlands.

 

[mpeugeot]

Thanks! The whole point was to comfort those with the 4.46 like myself
How will you get past the traction control system? The difference in wheel speeds will throw the ABS codes, so im just curious as to the fix!

by holding down the traction control button to turn off advancetrac.

 

[Mattwings]

Forscan (I think?) and several of the tune kits have parameters to change tire size and gearing. One of my Bronco owning associates has 37s on his Outer Banks and the dealer re-programmed the ecm to adjust. I have been surprised at how well it does with the 4.27 gears.

 

[Jimmyleetennessee]

Forscan (I think?) and several of the tune kits have parameters to change tire size and gearing. One of my Bronco owning associates has 37s on his Outer Banks and the dealer re-programmed the ecm to adjust. I have been surprised at how well it does with the 4.27 gears.

I have forscan, when I recieve my bronco I may be able to verify- depending on if my license is still good.

 

[Mattwings]

I have forscan, when I recieve my bronco I may be able to verify- depending on if my license is still good.

I am sure someone will chime in. I am not a forscan expert and I am hesitant to use it until my warranty is expired. I do plan to go slightly larger, to a 287/75/17 tire when my current 33s wear out. Now that "35s" are the defacto "standard" for modified off road rigs, the ruts I encounter on trail are sometimes a bit deeper than the 33s like. Good news, no more 2.73 open diffs to have to re-gear and upgrade like the "old days"

 

[Bmadda]

Changing tire size doesn't effect the rate at which sensors are spinning with regard to the ABS system. It's two completely different examples. Your speed sensor and ABS system must keep the same linear relation in order to function properly. Changing your tires makes the diff spin slower to maintain the same speed, it doesn't change the linear relation.

The abs sensors read wheel speed. Changing tire size is the ONLY way to change the speed they read. Also Bronco (like most newer vehicles now), does not have a separate vehicle speed sensor, vehicle speed data is transmitted over CAN by ABS. So a gear ratio change would not affect vehicle speed reading at all.

 

[Jimmyleetennessee]

The abs sensors read wheel speed. Changing tire size is the ONLY way to change the speed they read. Also Bronco (like most newer vehicles now), does not have a separate vehicle speed sensor, vehicle speed data is transmitted over CAN by ABS. So a gear ratio change would not affect vehicle speed reading at all.

You are very much incorrect. The ABS sensors generate electricity as they turn. This information is measured and enterpreted by the vehicle and compared to the wheel speed sensor. If you change the tires, the relationship between the speed sensor and ABS sensor keeps the same linear relationship, running in parallel. This will not cause any issues. However, if you change the differential gearing, now the ABS sensor and Vehicle Speed Sensor have a different linear correlation, causing a fault.

 

[Bmadda]

You are very much incorrect. The ABS sensors generate electricity as they turn. This information is measured and enterpreted by the vehicle and compared to the wheel speed sensor. If you change the tires, the relationship between the speed sensor and ABS sensor keeps the same linear relationship, running in parallel. This will not cause any issues. However, if you change the differential gearing, now the ABS sensor and Vehicle Speed Sensor have a different linear correlation, causing a fault.

There is NO vehicle speed sensor on a 6G Bronco. ABS doesn't measure the voltage of the WSS, it measures frequency. Most vehicles built in the last 10 years are this way. A taller tire at a given road speed will generate a lower speed signal than a smaller diameter tire. You are correct, as long as all 4 are the same, the computer doesn't care, however, the speedo, and the data sent to the PCM will be lower than true road speed when a taller tire is installed. Steeper gears will not affect this. There are easy ways to reprogram it also, but trust me this is how it works

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