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Gear Ratio/Tire Size Calculator

Postby myoung84 » Thu Jul 11, 2013 3:35 pm

I posted this in another thread but thought I would create a new thread for it. Maybe we could get this stickied? Since us PW guys are always changing things up, this is a good way to do the calculations and see where you'll end up.

Here's a link to an excel spreadsheet calculator that I made a long time ago and use all the time. This does everything you could possible want for tire sizes and gear ratios. On the far right side, there are comparisons for the 4.10 and 4.56 ratios in high and low range for the 66RFE. I've also got some stuff on there for the 8 speed that's in my Jeep. Can you imagine having this in the Power Wagon? That would totally make up for the 4.10s with an almost 50:1 crawl ratio in first gear! Then with 4.56s you're looking at a massive 58:1!

https://dl.dropboxusercontent.com/u/323 ... ulator.xls
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Re: Gear Ratio/Tire Size Calculator

Postby Pit Slave » Thu Jul 11, 2013 5:32 pm

You got it. BAM!!! stickied!
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Re: Gear Ratio/Tire Size Calculator

Postby myoung84 » Fri Jul 12, 2013 7:03 am

Thanks!
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Re: Gear Ratio/Tire Size Calculator

Postby Throttle 8 » Sat Jul 13, 2013 7:05 pm

Those of us with the G56's have a crawl ratio of 78:1. The 2014 has some excellent new features, but the gear ratios on the G56 keep me from even thinking about changing. That, and the fact that I've only got 35,000 miles on my '07. :D
2007PW, black, quad cab, G56 6spd, heated leather, sunroof, dual zone climate, Mickey Thompson Baja MTZ (315/70/17), Locker Bypass, TPS Bypass, Lund tonneau, N Fab nerfs, wheel wheel liners, K&N filter, bedliner, PIAA headlights, PIAA foglights, 24" LED lightbar behind grill, Carli Diff guard, Dodge Off Road steering brace, Carli High Clearance Control Arms, Carli Trac Bar, Bilstein 5100 shocks, Carli ball joints, updated "T" style linkage, Odyssy battery, recovery gear, Studded Goodyear Duratrack 315/70/17 for winter




MY OTHER VEHICLE IS A LOCOMOTIVE
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Re: Gear Ratio/Tire Size Calculator

Postby jbouwman25 » Tue Jul 23, 2013 6:01 pm

Neat spreadsheet!



I happened upon this site a few years ago and I find it helpful too...

http://ctny.audiworld.com/mark/s4/gears/gear_calc.html
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Re: Gear Ratio/Tire Size Calculator

Postby TwinStick » Fri Jul 26, 2013 1:50 pm

Throttle 8 wrote:Those of us with the G56's have a crawl ratio of 78:1. The 2014 has some excellent new features, but the gear ratios on the G56 keep me from even thinking about changing. That, and the fact that I've only got 35,000 miles on my '07. :D



YEAH......so there !!! 32,000 on my 08. :thppt: :thppt: :thppt: :rockon: :lol:
2008 Red QC PW G56. No lift yet, stock size tires. It pulls a 2016 Starcraft AR One Extreme, 3500 lbs.
Load Pro 35 helper springs. 2015 A.R.E. MX Series custom cap. PCP front diff cover protector. Mag-Hytec 6 qt rear diff cover. K&N replacement air filter only. Dual grounded throttle body. Winch TPC bypass. Fab Four rear bumper. DURA BAK lined rocker protection. And a bunch of new front end stuff.

G-56 Gear ratios: 1st) 6.29:1 2nd) 3.48:1 3rd) 2.10:1 4th) 1.38:1 5th) 1.0:1 6th) 0.79:1 Rev 6.29:1 --- = 78.01613:1 Crawl Ratio
-------------------------5.94:1--------3.28:1-------1.98:1-------1.31:1-------1.0:1-------0.74:1-----5.42:1 ---- = 73.675:1
545RFE----------------3.0:1---------1.67:1--------1.0:1--------0.75:1-------0.67:1------------------3.0:1 -------=37.21:1

2013+ 32.47 crawl ratio...............Can you see the trend ??????????????
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Re: Gear Ratio/Tire Size Calculator

Postby MSparks909 » Sun Nov 17, 2013 8:57 am

TwinStick wrote:YEAH......so there !!! 32,000 on my 08. :thppt: :thppt: :thppt: :rockon: :lol:


Sigh*. Sitting at 98K right now.
2006 QC PW G56

Suspension: 3" Thuren Diesel coils, Carli Progressive leaf springs, Thuren DYSKO bumpstops, Thuren control arms, Thuren tracbar, Thuren draglink, King 2.5" remote reservoir front shocks/2.5" King DBL bypass rear shocks, limit straps, factory swaybar end links extended 2",

Engine/Drivetrain: Airaid full intake, Airflow snorkel, Magnaflow y-pipe, 3" Flowmaster Super 44, Jet 180 t-stat, locker bypass. Carli balljoints. greasable front u-joints, Gorilla Juice in the G56, Royal Purple 75W-140 in the diffs, Shell Rotella 5W-40 in the engine w/ oversize K&N filter.

Body/Appearance: Go Recon super white cab lights, Retro Solutions 55W 6000K HID kit for headlights/fogs and projector retro'd headlight, Carli front diff guard, Rockcrusher rear diff guard, lots of pinstriping & some dents

Interior: 12" JL Audio sub in custom box w/ adjustable bass knob and 500W JL Audio amplifier, headrest gun sling, CB radio
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Re: Gear Ratio/Tire Size Calculator

Postby Trouble Maker » Wed Dec 25, 2013 7:21 pm

I used this site http://www.grimmjeeper.com/gears.html when deciding on gears for my SAS 02 Dakota QC. Very handy and shows a gear by gear breakdown with a side by side comparison chart.
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Re: Gear Ratio/Tire Size Calculator

Postby SheepdogOutdoorsman » Tue Jun 10, 2014 2:33 pm

I thought this might be helpful. I recently came across a calculation for torque loss (to the ground) due to larger tire diameters. It's pretty basic.

For every inch of additional tire diameter torque (to the ground) is reduced by 3.5%. So, if you go from 33's to 35's you lose 7% of your torque (to the ground). 33's to 37's would decrease torque (to the ground) by 14%. In my 2013, with the 5.7L (400ft/lbs of torque) I would lose 28ft/lbs of torque (to the ground) going to 35's and 56 ft/lbs of torque (to the ground) going to 37's.

Of course, this is a variable driven calculation, but it should give a base line for understanding what gains in engine performance/drivetrain efficiency are necessary to compensate for larger tires.

Helpful to anyone?


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Re: Gear Ratio/Tire Size Calculator

Postby adeluca73 » Tue Jun 10, 2014 9:15 pm

Yeah--good rule of thumb
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Re: Gear Ratio/Tire Size Calculator

Postby 2wagons1driveway » Sat Aug 23, 2014 5:56 am

SheepdogOutdoorsman wrote:I thought this might be helpful. I recently came across a calculation for torque loss (to the ground) due to larger tire diameters. It's pretty basic.

For every inch of additional tire diameter torque (to the ground) is reduced by 3.5%. So, if you go from 33's to 35's you lose 7% of your torque (to the ground). 33's to 37's would decrease torque (to the ground) by 14%. In my 2013, with the 5.7L (400ft/lbs of torque) I would lose 28ft/lbs of torque (to the ground) going to 35's and 56 ft/lbs of torque (to the ground) going to 37's.

Of course, this is a variable driven calculation, but it should give a base line for understanding what gains in engine performance/drivetrain efficiency are necessary to compensate for larger tires.

Helpful to anyone?


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I'm guessing the additional weight has a huge impact on additional tire height/torque loss also. Deffinately not as dramatic but would have an effect. Really wishing they made 5.13's for the 10.5 latelly. Don't want to touch my engine or programming to make power and compensate for the 37's


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Re: Gear Ratio/Tire Size Calculator

Postby SheepdogOutdoorsman » Sat Aug 23, 2014 6:34 am

2wagons1driveway wrote:
SheepdogOutdoorsman wrote:I thought this might be helpful. I recently came across a calculation for torque loss (to the ground) due to larger tire diameters. It's pretty basic.

For every inch of additional tire diameter torque (to the ground) is reduced by 3.5%. So, if you go from 33's to 35's you lose 7% of your torque (to the ground). 33's to 37's would decrease torque (to the ground) by 14%. In my 2013, with the 5.7L (400ft/lbs of torque) I would lose 28ft/lbs of torque (to the ground) going to 35's and 56 ft/lbs of torque (to the ground) going to 37's.

Of course, this is a variable driven calculation, but it should give a base line for understanding what gains in engine performance/drivetrain efficiency are necessary to compensate for larger tires.

Helpful to anyone?


Sent from my Tandy 1000 using AOL Online


I'm guessing the additional weight has a huge impact on additional tire height/torque loss also. Deffinately not as dramatic but would have an effect. Really wishing they made 5.13's for the 10.5 latelly. Don't want to touch my engine or programming to make power and compensate for the 37's


Sent from my iPhone using Tapatalk


I second that. I'd love to get a lower gear ratio to compensate for bigger tires, but just don't see myself putting an 11.5 in my truck.
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Re: Gear Ratio/Tire Size Calculator

Postby Txpowerwagon » Fri Jun 12, 2015 11:34 am

Has anyone changed to 4.56 or 4.88 on a 2015? I want to help my towing and low end with 35s and for 37s next year.. who has the best gears for the 15?
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Re: Gear Ratio/Tire Size Calculator

Postby 2wagons1driveway » Fri Jun 12, 2015 1:22 pm

If your going that high of a tire and towing you better look at 5.13's my friend.


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Re: Gear Ratio/Tire Size Calculator

Postby 05PWrockcrawler » Thu Jun 18, 2015 1:56 pm

You can get 5.13 gears for your 2015 u have an 11.5 rear. I need 5.13 gears really really bad lol


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Re: Gear Ratio/Tire Size Calculator

Postby 2wagons1driveway » Fri Jun 19, 2015 6:44 am

Lol yes you do. Or a supercharger 05. Id imagine supercharger is a few grand more then gears and a new rear axle thoigh


"Escalators are never really broken...their just stairs for alittle while... "
if guns kill people
pencils mispell words
cars make people drive drunk
and spoons made rosie o'donnel fat

"The one thing you realize when you aquire your trade standard is you realistically don't know Anything"
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Re: Gear Ratio/Tire Size Calculator

Postby olyelr » Fri Jun 19, 2015 1:15 pm

2wagons1driveway wrote:...Id imagine supercharger is a few grand more then gears and a new rear axle thoigh


"Escalators are never really broken...their just stairs for alittle while... "


Re-gearing is a better way to go about it anyway.
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Re: Gear Ratio/Tire Size Calculator

Postby 2wagons1driveway » Fri Jun 19, 2015 4:10 pm

It is much easier on the trans etc however with 37's I think your alittle under driven still... 4.56 are a nice gear set up for up to 37's in my 4th gen I upshift just a bit more on hills but the free spin kit has helped free up a bit of power as well


"Escalators are never really broken...their just stairs for alittle while... "
if guns kill people
pencils mispell words
cars make people drive drunk
and spoons made rosie o'donnel fat

"The one thing you realize when you aquire your trade standard is you realistically don't know Anything"
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Re: Gear Ratio/Tire Size Calculator

Postby TwinStick » Sun Mar 13, 2016 10:50 pm

Wow, old thread alert.

DO NOT QUOTE ME ON THIS but---If i am not mistaken the newest 11.5's are different than the old/er 11.5's & the gear sets do not interchange. I think i read the pumpkin needs to be modified or else they dont work at all. Maybe someone with more knowledge than me will chime in.

:popcorn:


& for the record---I have anxiety now because my 08' is coming up on 41k !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :lol:
2008 Red QC PW G56. No lift yet, stock size tires. It pulls a 2016 Starcraft AR One Extreme, 3500 lbs.
Load Pro 35 helper springs. 2015 A.R.E. MX Series custom cap. PCP front diff cover protector. Mag-Hytec 6 qt rear diff cover. K&N replacement air filter only. Dual grounded throttle body. Winch TPC bypass. Fab Four rear bumper. DURA BAK lined rocker protection. And a bunch of new front end stuff.

G-56 Gear ratios: 1st) 6.29:1 2nd) 3.48:1 3rd) 2.10:1 4th) 1.38:1 5th) 1.0:1 6th) 0.79:1 Rev 6.29:1 --- = 78.01613:1 Crawl Ratio
-------------------------5.94:1--------3.28:1-------1.98:1-------1.31:1-------1.0:1-------0.74:1-----5.42:1 ---- = 73.675:1
545RFE----------------3.0:1---------1.67:1--------1.0:1--------0.75:1-------0.67:1------------------3.0:1 -------=37.21:1

2013+ 32.47 crawl ratio...............Can you see the trend ??????????????
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Re: Gear Ratio/Tire Size Calculator

Postby olyelr » Mon Mar 14, 2016 7:14 am

TwinStick wrote:Wow, old thread alert.

DO NOT QUOTE ME ON THIS but---If i am not mistaken the newest 11.5's are different than the old/er 11.5's & the gear sets do not interchange. I think i read the pumpkin needs to be modified or else they dont work at all. Maybe someone with more knowledge than me will chime in.

:popcorn:



Loveracing1988 should be chiming soon....
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