Topic: Why do so many people run 4.11 ratios?

[dntsdad]

I am just wondering as to why I see so many guys running 4.11 gears in their built Toyota axles.

I often see front axles that have to be in the ++ $2000 range with Longfields, Detriot or ARB, and all the other goodies and they are running 4.11 ratios still. It seems that is the CHEAP thing to change in a fully built axle.

It seems that 5.29 is the way to go with 35" or larger tires but that is why I am asking I must be making some wrong assumptions since these guys know more than I do.

For me I have a 92 excab, 3.4 swap, R150 and dual cases with 2.28/4.7 Its still IFS with a stock 4.56 ratio and I have 33's. When I SAS I plan to change to 35" with a 4" spring and F150's in the rear.

As I search for parts for the swap, I am still unclear on what to also look for as far as a ratio goes. I have been passing on 4.11 ratios but with the low dual cases, is that a viable option?? I don't what it to be a dog on the road or over steep grades on the highway, but I also do not want to spin 5000 RPMs either at 55mph:rolleyes:

This is a daily driver!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[88_Pathy]

With a 3.4 you can get away with the 4.10 gears but I would be looking for some 4.88's.  With 4.10's you are adding a lot of extra stress to the t-case and people have destroyed the cases because of lack of gearing at the axle. I have 37's, 4.88's, and a 3rz 70mph=3000ish RPM

[yota4x4sc]

people only run the 4.10s cuz there the stock gear and they never changed them, it aint the ideal gear unless u want highway fuel economy wit stock tires

[79coyotefrg]

they use 4.10's because thats what most pickups came with STOCK.  Some people also THINK the 4.10's are stronger but I don't buy it.  what causes a R&P to break is bad setup.

if you dont have the coin to spend on 5.29's (what I run with 35's and 65mph is 3100 RPM) then keep the 4.56 in your rear axle and find 4.56 for your front.

but to be honest i'd run what you have till the ifs falls off.

[possume22]

i run stock gears because with dual cases and 4.7 in the back case even with 42 iroks i dont need any lower gearing and why spend the money for something i dont need. if i didnt have the 4.7 i might do the diffs

[Tofudude]

4.11 are a little diffrent than the 4.10's though right?

[emsvitil]

4.11 are a little diffrent than the 4.10's though right?

37 / 9  ring and pinion

vs

41 / 10 ring and pinion


With the extra transfer gear, you don't need to regear the differentials for a lower crawl ratio.


Plus they are probably out of money after spending it on the 2nd transfer case.

[BoG-ToY]

it truly has everything to do with STOCK.

if you dont need more gearing, some people dont mess with it, I personally cannot stand a clutch, 35s and 4.10s.

spares. when your on a trip, and you BREAK a 4.10, theres a good chance theres a spare floating around or a junkyard...  odds of finding a spare 4.10 is just way better. not ready to mess with the rear, cuz your just doing a solid axle swap, well, you build your front to match your rear, then when the rear needs messed with, you dont wanna mess with the front...

bout sums it up I think

[gnob]

because if you launch a geared third, its $$$ compared to a stock that can be had for 50$

[blackdiamond]

For people that mianly use their rigs on the trail and don't drive much on the street, the difference between the gear ratios is less than 9% which isn't really worth spending the money on parts.  9% makes a huge difference on the street, but when you're almost always in low range it doesn't matter as much.  The difference between 4.70 and 2.28 t-case gears is a 106% difference.  The lower gearing that you run the less difference each % makes.  This is why it's best to match the R&P to your street tire size.
 

[1slowhatch]

37 / 9  ring and pinion

vs

41 / 10 ring and pinion



With the extra transfer gear, you don't need to regear the differentials for a lower crawl ratio.


Plus they are probably out of money after spending it on the 2nd transfer case.

+1.

[BoG-ToY]

My thoughts on this are tho, for serious rock crawlers (who should be running 1ton axles or 2.5s or mogs) but for those running their toyota axles hard, they SHOULD be running the LOWEST axle ratio they can, I hear stories of blown driveshafts, blown transfer cases and bad clutches. when a 5.71 diff (see ZUKs artical at gearinstalls.com before you say they are weak) is used in a toyota axle, it puts the actual WORK at the axles and out,
marlin sells thicker flanges, chromoly outputs, thicker outputs. having the LOWEST RATIO AVAILABLE would make all those parts see more RPM and less TORQUE.

[blackdiamond]

My thoughts on this are tho, for serious rock crawlers (who should be running 1ton axles or 2.5s or mogs) but for those running their toyota axles hard, they SHOULD be running the LOWEST axle ratio they can, I hear stories of blown driveshafts, blown transfer cases and bad clutches. when a 5.71 diff (see ZUKs artical at gearinstalls.com before you say they are weak) is used in a toyota axle, it puts the actual WORK at the axles and out,
marlin sells thicker flanges, chromoly outputs, thicker outputs. having the LOWEST RATIO AVAILABLE would make all those parts see more RPM and less TORQUE.

I'm not sure I understand what you're saying.  Assuming a set speed (mph) as when the differential gears are changed from 4.10 to 5.71 the engine RPM will increase and the available torque will increase.  A numerically higher gear ratio will produce more torque AND and higher RPM.

Are you suggesting that by putting the engine at a higher RPM you'll be in a part of the toque curve where there is actually less torque?  What am I missing?

[BoG-ToY]

you will NEED less torque to provide the same final output

[blackdiamond]

you will NEED less torque to provide the same final output

True, so your theory is that it's better to reduce the stress in the transmission, transfer case and driveshafts and instead load up the axles and hubs.  Considering that the hubs and front axles are likely the weak link in any Toyota's I'm not sure I'd go that route...at least for this reason.  I still think it's matters the most for street driving which put me at 4.88 gears.

[BoG-ToY]

for sure,

I guess it depends on the driver, if you push your truck to the max, then stock gears will "protect you" if you have a set bit of wheelin, lower gears to make it up that same stretch would be better on other components