Ok guys, I have a simple question.

When it comes to the v10's, Do you actually get more torque out of 4.30 gear as opposed to the 3.73's or are they the same?

Everyone says that the 4.30's out pull 3.73's, If they produce the same torque, how can that be!

 

dude?... you get higher rpms at the same speeds.. so you get more torque at 65mph with higher gears... the V10 itself is the same

 

Dude yourself, people ask question to get a better understanding, if you felt this was a dumb question then you should have not given your half assed answer. Your answer does not help at all!

 

The change in gear ratio gives you a mechanical advantage. To move the tire one revolution, the driveline needs to turn 3.73 times with the 3.73 gears. With the 4.30 gears, you will need to turn the driveline 4.30 revolutions to move the tire the same distance. Horsepower (ability to do work) is the amount of force required to move a set weight a set distance. Here are the constants, your truck will remain the same weight and we want to move the tire the same distance. The driveline will turn more revolutions with the 4.30 gears to match the amount of revolutions required with 3.73 gears. The load remains the same, but the distance (revolutions traveled by the driveline) increases with the 4.30 gears. Since the load is the same but the distance increase, the force required per unit smaller (ie. easier).

Another example of this mechanical advantage is: Imagine a rusted nut. I requires a set amount of force to break it free. This force required is the same no matter how big of a wrench you use, but you gain mechanical advantage with a longer torque arm. A longer wrench will have to travel a greater distance to turn the nut the same amount of turns as a shorter wrench would require. The longer distance travelled amounts to less force per unit of distance travelled and is easier to perform.

Changing the gear ratio is effectively increasing you mechanical advantage to perform the same work. This does not take in effect higher RPM's of your engine and the any changes in the powerband, will should show the advantage of lower gears.

 

Thank you very much for that understanding. the torque wrench example was great. So in a nutshell the torque rating stays the same, its just with the 4.30's its max power can be acheived much easier. right?

 

Think of it in terms of a 10-speed bike. If you're stopped and you're in 6th gear, it'll take you a whole lot of effort to get going again. Now if you start out in 1st gear, you'll get rolling very easily. The 3.73 is like 2nd or 3rd on the bike and the 4.30 is more like 1st. So the answer is that with the 4.30's you get more torque earlier than the 3.73's. My 99 F250 5.4L 5-speed with 4.10 could get going at a stop light with just a little over 1100 rpm while my 2003 5.4L 6-speed with 3.73 takes about 1300 rpm to get going at the same rate. (...without people giving me the finger because I'm pulling away too slow from a stop light) On the flip side, the 2003 will cruise at 1650 rpm at 60 mph while the 99 would do so at 1760 rpm. Because of the 4.10, my 1999 felt like it had more power than the 2003. It's kind of a lame answer but does that make any sense?

 

Yes, that makes a lot of sense. It gets your load going easier. Not more torque overall, but more available torque earler.

thanks for your time to answer my question. To some it may seem stupid but i honestly didnt know. But now I do. Thanx n578md and Twin Tritons

 

The Torque rating for your V-10 will stay on a constant arc.... if it hits peak torque at 2000 rpm, then it will reach peak torque at 2000 rpm no matter what gearing you have. Now, the difference in gearing affects when that peak rpm range is achieved while driving. 4.30 gears will put your engines peak torque at whatever rpm at a slower speed, and will give you a slower overall speed. 3.73 gears will put that peak torque at a higher speed. That is why having 4.30 gears will allow you to seemingly outpull the same truck with 3.73 gears, is because the 4.30's are allowing your engine to hit its peak sooner. But, in turn, the 3.73 gears will allow the same engine to have that peak at higher road speeds.

Sorry for rambleing, hoped that put another perspective on this... and that it made sense.

Tim

 

Your V-10 engine has the same amount of torque and horsepower at the flywheel no matter what gears you have. How your transmission, transfer case, and rear differential gears multiply that affects how much work you can perform. From a 2003 F-350 manual, a F-350 CC 4x4 automatic with a V-10 can tow 9700# with 3.73 gears vs. 12,500# with 4.30 gears. The only difference is the mechanical advantage provided by the different gear ratios, everything else remains the same. The same amount of torque and horsepower supplied by the engine can perform more work.

 

since it has been answered, and very well, yet still is getting answered, ill put yet another figger in der'

3.73:1 rr gears x 425ftlbs of tq x first gear in auto tranny of 2.84:1 = 4505 ftlbs
4.30:1 rr gears x 425ftlbs of tq x first gear in auto tranny of 2.84:1 = 5193 ftlbs

6.0 psd for example
3.73:1 x 560ftlbs x3.09:1 first gear = 6456 ftlbs (in 4lo = 17,562 ftlbs!!!)

 

mattsf250,

Thanks for putting the numbers out for everyone to see, it really helps. I wanted to do that yesterday, but have been busy here at work with the Sasser.worm attacking everything. I have 2 more computers to fix and things should be good again.

FYI, I was test driving a 6.0 SRW with 3.73's and a 6.0 DRW with 4.10's both pulling a 10,000 trailer. I found it almost to easy to spin the rear tires with the added torque available to the rear tires with the dually when pulling the trailer. I had to watch how fast I accelerated from stop lights or up on-ramps.