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Old 01-19-2007, 12:07 PM   #1
GOT COPE?
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Exclamation Gear Ratio Calculator

This has been around a while, Ive used it before, but until today I had never scrolled past the crawl ratio table to the bottom of the page, at the bottom it tells you your rpms at a given speed. This seems to be very accurate and is all calculated for you. No brain power required


http://www.grimmjeeper.com/gears.html

This calculator will tell you the following:
All final drive ratios.
Crawl Speed at Given RPM in Feet Per Minute
Road Speed at Given RPM in Miles Per Hour
Road RPMs at Given Speed

There are options to factor in crawlers, axle gears, and tire size. He might add in a 3 tcase calc for anyone running triples.

And each table, except the final drive table, has scroll menus so you can change rpms and mph.

And the last thing is there are 2 columns so you can do side by side comparisons of different setups.

For anyone unfamiliar with this subject read on.

In step 1 you choose your tranny.

2.7 5spd = W59
3.4 5spd = R150F
2.7 and 3.4 autos got either the A340F or the A340E.
As Ive stated below all choices will produce a 2.57 t-case low so it shouldnt screw up the numbers too much if you pick the Toyota tranny.

One thing though, on step 2, there is only one Tacoma tranny listed A340F. This step determines your t-case ratio even though you are selecting your tranny again. So if you have a 95.5 and up Tacoma, 4runner or FJC choose the A340F tranny.

EDIT: A Toyota Tacoma and FJC option has been added. Choose that for your t-case ratio.

Xtra Info:
This guy is in the process of adding choices: W59 R150F and A340E to step 2. They will all produce the same 2.57 tcase low, but its nice just to get the details right.

As for you 6-speed guys I dont think he's gotten that far yet. im sure he'd be gald to add it in but he may need some help from ya'll to get it correct as I believe he's a Jeeper. But give him some slack he's created an outstanding calculator.

http://www.grimmjeeper.com/gears.html
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This may be useful as well.
http://www.ttora.com/forum/showpost....0&postcount=22

Quote:
Originally Posted by GOTCOPE?
So here's my little chart. It is not perfect, there are exceptions, but its very close.

I dont include 4.30's as an option as they are too rare too be considered IMO.

All tires assumed 12.50's exceept the "31".
The 3.58 is proven to suck. The 3.91 is right behind it. Though it sneaks into the chart once, only b/c I added "31's".

31's (10.50)
2.7 A - Minumum 4.10 or 4.56. A 4.30 if you could find 'em is near perfect.
2.7 M 3.4A - Minimum 4.10
3.4 M - 3.91 or 4.10

33's
2.7 A - 4.88
2.7 M 3.4A - 4.56 or 4.88
3.4 M - 4.10 or 4.56

35's
2.7 A - 5.29
2.7 M 3.4A - 4.88 or 5.29
3.4 M - 4.56 or 4.88

37's
2.7 A - Dont do it you'll hate yourself
2.7 M 3.4A - 5.29 (either could get away with 4.88)
3.4 M - 4.88 or 5.29

For the drivetrain combos that have a "choice" base your decision on how much you wheel, what type of terrain you live in (hills, mtns, plains), amount of hwy driving, etc.

If you have a vehicle that is wheeled hard and put up wet, does a lot of hwy travel, and you live on the plains, but near the mountains, obviously its gonna come down to a coin toss.

PS Anyone feel free to argue. Do I even need to say that?
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Quote:
Originally Posted by GOT COPE?
Hey zero cool, everything looks good except you need to add a 2.57:1 t-case ratio option for us Tacoma and FJC guys.
And I think I read somehwhere that pre-Tacoma V6 pickups had a 2.56:1. Not sure though.

Ok I recall now that entering Toyota w/ A340F transmission gives the correct ratio 2.57:1 for us Taco guys.

The 2.7 4cyl Tacos have the W59 5spd tranny, so add in a Toyota w/ W59 and have that calculate a 2.57:1 tcase low.

The 3.4 6cyl tacos Tacos have a R150F 5spd, same tcase low 2.57:1.

The 4cyl and V6 auto is the A340E or A340F same tcase ratio 2.57:1 low.

RZN19# March1998-August1999 = A340E 3RZFE (2.7)
VZN195 March1998-August1999 = A340E 5VZ-FE (3.4)
VZN195 August1999-Spetember2000 = A340E 5VZ-FE (3.4)
VZN195 September2002- = A340F 5VZ-FE (3.4)
RZN196 September2002- = A340F 3RZFE (2.7)

The above is kinda irrelevant(before the calculator was updated), basically if you have a Tacoma it came with an A340F or E auto or a W59 or R150F manual and all have a 2.57:1 tcase.

And zero cool the fact you have the A340F as an option on the calculator is how I got the correct ratio even though I have a W59, but if you'd add in the other Toyota Tacoma tranny options that would be helpful and if you even denoted them as Toyota Tacoma A340F for example rather than just Toyota A340F that would be even easier for people I believe.
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Old 01-19-2007, 12:38 PM   #2
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That is a great site, and I used it in conjunction with a hand held gps to determine my what my new-to-me truck's gear ratio was.

A good amount of info in a single post.
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Old 01-19-2007, 01:28 PM   #3
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Yep that's the best one I've ever seen.
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Old 01-20-2007, 02:01 PM   #4
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Just so y'all know, I'm the one who wrote this calculator. While I'm a Jeep guy, I do want the tool to be usefull for everyone. I saw that some people were having a few issues with the Yota material. So I swapped a few things around and added some labels to make the Yota stuff a little clearer. I also added the FJ's 6 speed manual.

Let me know how you like the updates or if you want any changes. I may not get to it for a week but I'll do my best.

Oh, and please spread this link around to anyone who can use it. It's free for everyone. Post it in forums, put links on your web page, whatever you like to spread the word.

Last edited by zero cool; 01-20-2007 at 02:04 PM.
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Old 01-20-2007, 08:32 PM   #5
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Quote:
Originally Posted by zero cool
Just so y'all know, I'm the one who wrote this calculator. While I'm a Jeep guy, I do want the tool to be usefull for everyone. I saw that some people were having a few issues with the Yota material. So I swapped a few things around and added some labels to make the Yota stuff a little clearer. I also added the FJ's 6 speed manual.

Let me know how you like the updates or if you want any changes. I may not get to it for a week but I'll do my best.

Oh, and please spread this link around to anyone who can use it. It's free for everyone. Post it in forums, put links on your web page, whatever you like to spread the word.
where did you get the info for 5th gear on the Taco W59 tranny? I think the ratio should be .81 and not .85 the FSM has it at the latter even though Marlin's site lists it at .85 I know the W56 has .85

here are the '05 Taco tranny specs that you can add.
6sp manual

5sp manual

5sp AT
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Old 01-22-2007, 01:09 PM   #6
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Hey everyone. This is very useful. Thanks to the person who created it. Now I have a question about it though, I have a 96 tacoma V6 and I don't know what undersdrive I have. Can anyone help me out? The gears I don't even know what it has, I know though it is stock system. Read my sign. to see what I have on it so far. I want to know what MPG I'm getting. Thanks!
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Old 01-22-2007, 01:26 PM   #7
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Quote:
Originally Posted by damex85
Hey everyone. This is very useful. Thanks to the person who created it. Now I have a question about it though, I have a 96 tacoma V6 and I don't know what undersdrive I have. Can anyone help me out? The gears I don't even know what it has, I know though it is stock system. Read my sign. to see what I have on it so far. I want to know what MPG I'm getting. Thanks!
unless you have a crawler, Marlin or Inchworm, you don't have one
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Old 01-23-2007, 07:29 AM   #8
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Quote:
Originally Posted by damex85
Hey everyone. This is very useful. Thanks to the person who created it. Now I have a question about it though, I have a 96 tacoma V6 and I don't know what undersdrive I have. Can anyone help me out? The gears I don't even know what it has, I know though it is stock system. Read my sign. to see what I have on it so far. I want to know what MPG I'm getting. Thanks!
Look for yer gear ratio here: http://www.ttora.com/wiki

and like hytenor said, you aint got no underdrive
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Quote:
Originally Posted by Yotaoffroad27 View Post
I think Colin just rides around looking for a good photo op.
Quote:
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Blatent abuse of power ... but funny ... carry on ...
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Old 01-31-2007, 03:32 PM   #9
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*cough* sticky me.

Thank You.
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Quote:
Originally Posted by Yotaoffroad27 View Post
I think Colin just rides around looking for a good photo op.
Quote:
Originally Posted by crawlrunner View Post
Blatent abuse of power ... but funny ... carry on ...
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Last edited by GOT COPE?; 02-01-2007 at 08:41 AM.
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Old 05-30-2007, 10:28 AM   #10
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Quote:
Originally Posted by zero cool View Post
Just so y'all know, I'm the one who wrote this calculator. While I'm a Jeep guy, I do want the tool to be usefull for everyone. I saw that some people were having a few issues with the Yota material. So I swapped a few things around and added some labels to make the Yota stuff a little clearer. I also added the FJ's 6 speed manual.

Let me know how you like the updates or if you want any changes. I may not get to it for a week but I'll do my best.

Oh, and please spread this link around to anyone who can use it. It's free for everyone. Post it in forums, put links on your web page, whatever you like to spread the word.

Thanks Roy, you ROCK!
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Old 11-10-2008, 10:16 AM   #11
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good to know, thanks
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Old 11-16-2008, 01:58 AM   #12
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Thanks man, this is such useful information! I really appreciate it.
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Old 01-07-2009, 06:20 PM   #13
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Default gear calculator

Here is another one:
http://justdifferentials.com/index.p...id=2&chapter=0

also stocking all the taco gears!
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Old 04-06-2009, 04:07 PM   #14
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Good info as I'm contemplating 35's.
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Old 04-06-2009, 07:43 PM   #15
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Quote:
1996 - 2002 4Runner
Model Code

Ratio
RZN180L-GKMSKA 3.727
RZN180L-GKMSKA 4.100 With P265/70R16
RZN180L-GKPGKA 3.727
RZN180L-GKPGKA 4.100 With P265/70R16
RZN180L-GKPSKA 3.909
RZN180L-GKPSKA 4.300 With P265/70R16
RZN180L-GKPZKA 4.100
RZN185L-GKMGKA 3.909
RZN185L-GKMGKA 4.100 With P265/70R16
RZN185L-GKMSKA 4.100
RZN185L-GKMSKA 4.556 With P265/70R16
RZN185L-GKPGKA 3.909
RZN185L-GKPGKA 4.100 With P265/70R16
RZN185L-GKPGKA 4.300 Option With P265/70R16
RZN185L-GKPSKA 4.100
RZN185L-GKPSKA 4.556 With P265/70R16
RZN185L-GKPZKA 4.100
RZN185L-GKPZKA 4.300 Option
VZN180L-GKPSKA 3.727
VZN180L-GKPSKA 4.100 With P265/70R 16
VZN180L-GKPGKA 3.727
VZN180L-GKPGKA 4.100 With P265/70R 16
VZN180L-GKPZKA 4.100
VZN185L-GKMGKA 3.909
VZN185L-GKMGKA 4.100 With P265/70R16
VZN185L-GKPGKA 3.909
VZN185L-GKPGKA 4.100 With P265/70R16
VZN185L-GKPGKA 4.300 Option
VZN185L-GKPSKA 4.100
VZN185L-GKPSKA 4.300 With P265/70R16
VZN185L-GKPZKA 4.100
VZN185L-GKPZKA 4.300 With P265/70R16
RZN180L-GKMSKA 3.727
RZN180L-GKMSKA 4.100 With P265/70R16
RZN180L-GKPGKA 3.727
RZN180L-GKPGKA 4.100 With P265/70R16
RZN180L-GKPSKA 3.909
RZN180L-GKPSKA 4.300 With P265/70R16
RZN180L-GKPZKA 4.100
RZN185L-GKMGKA 3.909
RZN185L-GKMGKA 4.100 With P265/70R16
RZN185L-GKMSKA 4.100
RZN185L-GKMSKA 4.556 With P265/70R16
RZN185L-GKPGKA 3.909
RZN185L-GKPGKA 4.100 With P265/70R16
RZN185L-GKPGKA 4.300 Option With P265/70R16
RZN185L-GKPSKA 4.100
RZN185L-GKPSKA 4.100 With P265/70R16
RZN185L-GKPZKA 4.100
RZN185L-GKPZKA 4.300 Option
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Old 04-17-2009, 11:14 AM   #16
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What happened to the calculator link? It's just coming up with a page full of ads now
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Old 04-17-2009, 12:57 PM   #17
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Domain expired... hopefully he figures it out before the domain gets ganked by some unscrupulous... gotta go see about something brb.
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Old 04-17-2009, 01:44 PM   #18
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Quote:
Originally Posted by mt_goat View Post
What happened to the calculator link? It's just coming up with a page full of ads now
http://www.tyres1.com/tech_calcs.html
I use this one
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Old 04-20-2009, 08:12 PM   #19
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Quote:
Originally Posted by mt_goat View Post
What happened to the calculator link? It's just coming up with a page full of ads now
Sorry about that. I'm in the middle of a move and I updated my billing zip code on the credit card so the registration didn't go through. Bad timing. The site is back up and running though I lost the background image. At least I kept a working copy of the calculator on my system at home.

Oh, and they sent the billing notification to my old email address that I had disconnected during the move so I didn't catch it for almost a week.
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Old 04-20-2009, 09:02 PM   #20
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Quote:
Originally Posted by zero cool View Post
Sorry about that. I'm in the middle of a move and I updated my billing zip code on the credit card so the registration didn't go through. Bad timing. The site is back up and running though I lost the background image. At least I kept a working copy of the calculator on my system at home.

Oh, and they sent the billing notification to my old email address that I had disconnected during the move so I didn't catch it for almost a week.
Great thanks!
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Old 04-20-2009, 09:39 PM   #21
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Thanks! This will help determine my speedo error now that I have 4.88's and 35's

I think your crawl speeds are off though??? I punched mine in with the xfer and 4.7 underdrive, and my speed is comming up at 201 at 5000 rpm. Maybe the decimal has to be moved over 2 places?
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Old 04-20-2009, 10:02 PM   #22
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Quote:
Originally Posted by NorcalPR View Post
Thanks! This will help determine my speedo error now that I have 4.88's and 35's

I think your crawl speeds are off though??? I punched mine in with the xfer and 4.7 underdrive, and my speed is comming up at 201 at 5000 rpm. Maybe the decimal has to be moved over 2 places?
Crawl speeds are in feet per minute, not miles per hour. To get miles per hour, divide by 88.
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Old 04-20-2009, 10:07 PM   #23
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Ah, makes sense.

Thanks!
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Old 04-20-2009, 10:47 PM   #24
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Ok, I'm busting my brains out.

I'm running tyhe R150F tranny, and stock was 30.46" tires, with 4.11's...
Now I am running 34.46" tires, with 4.88's.

Can anyone help me determine the error? I think it's at about 5.6%
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Old 04-21-2009, 04:25 PM   #25
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The way I calcluate it, your driveshaft will be spinning 4.952% faster with your current setup than it did with your stock setup at any given speed. That means your speedo is running 5% higher than it used to at any given speed.

So when your speedo says 65, you're really going about 62.

Naturally, you can have up to a 10% variance between speedo reading and actual speed from the factory. This can vary over time. The difference in air pressure between cold and warm tires can have that much impact.


For all intents and purposes, you're in the "close enough" category.
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Old 04-21-2009, 05:18 PM   #26
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Well, I went from a 30 tooth, to a 33 tooth. I could theoretically go to a 32 tooth, and be only 1% off.

I wasn't too far off though . Thanks!!!!!!
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Old 05-03-2009, 10:19 AM   #27
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Except for that annoying background image, that is a really nice calculator.

Back in 1999 or 2000 I built this one for Marlin's site:
http://marlincrawler.com/java/getspd_calc.html

That was made a loooooooooong time ago and I've always wanted to improve it. Now that I've got the new Marlin Crawler website running, I have been wanting to bring back this old jew with many, many more options.

Thanks for the link, it has given me a lot of great ideas!

Mike
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Old 06-18-2009, 11:12 AM   #28
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Under the "Tire Size Change, find new differential ratio."

I plugged in my numbers... New tire diameter is 33 and old 31. Current gear ratio is 4.10 im guess becasue I still have stock gears... so, whenit calculates the new info, is this telling me what gears to get?
Hi=3.97
New=4.36
lo=4.76
actual= 3.85


If im understanding this right, tthen 4.36 is the gears it recomends to get for 33 inch tires. I seemsm, however, that 4.56 is what most people use....How will the 4.56 compare with the 4.36 for power and gas milege?

Thanks and sorry for the noobness....
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Old 06-18-2009, 05:04 PM   #29
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Quote:
Originally Posted by jentzschman View Post
Under the "Tire Size Change, find new differential ratio."

I plugged in my numbers... New tire diameter is 33 and old 31. Current gear ratio is 4.10 im guess becasue I still have stock gears... so, whenit calculates the new info, is this telling me what gears to get?
Hi=3.97
New=4.36
lo=4.76
actual= 3.85


If im understanding this right, tthen 4.36 is the gears it recomends to get for 33 inch tires. I seemsm, however, that 4.56 is what most people use....How will the 4.56 compare with the 4.36 for power and gas milege?

Thanks and sorry for the noobness....
gears only come in certain ratios, you don't get to pick any # you want
for the taco: aftermarket gears are 4.56, 4.88 and 5.29. OE are 3.58, 3.91, 4.10, 4.30 and 4.56 (some Runners had OE 4.88s but not in the Taco)

all of those "charts" do NOT take other factors into account: more aero drag, more weight, wider tires have more rolling resistance, etc. So, you havt to go with a lower ratio (higher #) to begin to compensate. And, with so little hp and torque from these engines you can only compensate just so much
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Old 01-23-2010, 11:45 AM   #30
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This is some really great info posted. It seems everyone pretty much has or is planning on getting bigger tires so it makes a great reference.
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