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Too high of gears? 91 4x4 M/T, confused...

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Old 08-17-2013, 01:00 PM   #1
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Too high of gears? 91 4x4 M/T, confused...

So, I've got an interesting situation that I can't make sense of. The sticker says that stock, I'm supposed to have 225/75 R15 tires (which I do, for now) and that I've got G254 gears (4.56).

Here's the part I'm confused on. I know that the previous owner had 31's on it, since the spare is a 31. However, those aren't stock according to my doorjamb. Recently, I've noticed that my odometer was running a little high compared to my GPS and Google Maps and it turns out it's right, when the speedometer reads 70 MPH (highway speed) I'm actually going only 64 MPH! Also, my engine revs at 3200 RPM at "70". From here to my parent's house it's 91 miles, but my odometer will read 100.

Here's what the door jamb says so you know I'm not going crazy.



So... anyone know what size gears I actually have? Or did stock gears read high straight off the factory floor? Is there any way to check?

P.S. And on a final note... that means my MPG is only 15 city and 20 highway . I thought I was getting 16.5 city and 22 highway... still at 33% improvement over when I got it but the high numbers were fun to brag about...
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Old 08-17-2013, 01:31 PM   #2
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Try looking at the color dot on the pinion if its yellow they are a 4:56 ratio
pink = 4.10
orange = 4.11
blue = 4.30
green = 4.38
yellow = 4.56
white = 4.88
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Old 08-17-2013, 02:02 PM   #3
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I read that the dot isn't always accurate either especially if suspect that gears have been changed (4crawler.com).

Speedo converter
Original Tire Diameter: 31 (what used to be on there)

New Tire Diameter: 28.3 (225/75 R15)

Speedometer Reading (MPH): 70

Corrected Speed (MPH): 63.9

Taken from this site: http://www.jtoutfitters.com/pages.php?cID=2&pID=11

Does this mean my truck was made for 31"s and my doorjamb lies? If it helps at all, I run at 3200 RPM at "70" (really 64 MPH).
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Old 08-17-2013, 02:15 PM   #4
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If your truck has 28in tires and 3200rpm at 64mph it works out to 5.07 gear ratio if your transmission is in 5th (0.83). Your tach could be off also but I wouldn't think that much
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Old 08-17-2013, 02:17 PM   #5
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31 in tires at actually 70 equals out 5.07 gear ratio also.
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Old 08-17-2013, 02:21 PM   #6
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My door jamb info looks just like yours, however, I have 456 g254 gears and 31s. I was told that they imported our trucks with smaller tires because the tariff was cheaper and installed larger tires after they got here. I dont know that for sure, thats what a dealer told me. He also told me they imported all of our trucks without ac and installed it over here to save money. Mine is a 90 sr5 v6. I was also told that mine wasnt imported as an sr5, that most of the add ons was done here and that kinda makes sense looking at the door info and I know mine was sold new with 31s. He told me that most trucks were imported as base models because of the cheaper tarriff, and basically remanufactured here. That would explain the door info being right on the gears and wrong on the tires. Im not putting this out as gospel, this is what a dealer who is a friend of mine told me. Hope this helps.....
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Old 08-17-2013, 02:25 PM   #7
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recently i bought a bluetooth OBD 2 adapter and an app for my phone that shows computer info. i've found that my GPS and the torque app reads differently from my speedometer. both read up to 3-4 MPH different than my speedometer shows. my truck is stock. so honestly i trust the actual speedometer more than anything
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Old 08-17-2013, 02:33 PM   #8
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Originally Posted by fdp101452 View Post
My door jamb info looks just like yours, however, I have 456 g254 gears and 31s. I was told that they imported our trucks with smaller tires because the tariff was cheaper and installed larger tires after they got here. I dont know that for sure, thats what a dealer told me. He also told me they imported all of our trucks without ac and installed it over here to save money. Mine is a 90 sr5 v6. I was also told that mine wasnt imported as an sr5, that most of the add ons was done here and that kinda makes sense looking at the door info and I know mine was sold new with 31s. He told me that most trucks were imported as base models because of the cheaper tarriff, and basically remanufactured here. That would explain the door info being right on the gears and wrong on the tires. Im not putting this out as gospel, this is what a dealer who is a friend of mine told me. Hope this helps.....
That would make sense. It's not worth regearing going from 225/75R15 to 31's, that's why I'm so baffled by all this.

I double checked the accuracy of the GPS by comparing with my wife's '11 Nissan Altima. GPS said 70, Speedometer read 70.
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Old 08-18-2013, 07:20 AM   #9
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From how your speedo is reading higher than actual speed it sounds correct that you are geared lower for the tires you're running. It's good for low end power and city/trails but not ideal for highway trips. I personally would mess with gears, I would just swap to 31" tire which should balance everything out- also fills out the wheel wells more without any rubbing anywhere. 31s can be found all day long on CL used. Also you have a good selection of new tires in this size since its so common for stock SUVs to come with them. Price is significantly less than what a 33+ costs these days.
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Old 08-18-2013, 12:24 PM   #10
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My truck is a DLX. Door jam says 225/75r15 has had 31/10.50r15 since new. Speedometer reads spot on. Spare tire and factory tires had 31's aftermarket extra's also had 31's. So I would say put 31's on and it should be good.
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Old 08-18-2013, 01:17 PM   #11
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Thishttp://www.yotatech.com/f116/mechani...l-pics-195986/
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Old 08-18-2013, 01:19 PM   #12
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You've got 4.56 gears, which is the gearing for the 31" tire package with manual trannies. The autos w/ 31" package got the 4.88s.

See here: http://www.brian894x4.com/Gearratiosanddiffs.html

The bottom half of this page has several other fyis for gearing etc: http://www.yotatech.com/f116/horribl...51/index2.html
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Old 08-18-2013, 02:57 PM   #13
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Originally Posted by fdp101452 View Post
My door jamb info looks just like yours, however, I have 456 g254 gears and 31s. I was told that they imported our trucks with smaller tires because the tariff was cheaper and installed larger tires after they got here. I dont know that for sure, thats what a dealer told me. He also told me they imported all of our trucks without ac and installed it over here to save money. Mine is a 90 sr5 v6. I was also told that mine wasnt imported as an sr5, that most of the add ons was done here and that kinda makes sense looking at the door info and I know mine was sold new with 31s. He told me that most trucks were imported as base models because of the cheaper tarriff, and basically remanufactured here. That would explain the door info being right on the gears and wrong on the tires. Im not putting this out as gospel, this is what a dealer who is a friend of mine told me. Hope this helps.....
I'm pretty sure you're spot on. My door sticker reads the 225 tires too, yet has 31" package when purchased new -- they ordered/built based upon final specs for stuff like diffs but did some conversions for $ savings once arrived here (I think in 90 or so the 2wd trucks were nearly all American made... I'm sure wikipedia would tell you, haha). Much of the SR5 stuff like the rearview mirror with map lights has wiring preinstalled on all trucks -- I think -- for easy swap in, etc, based upon what a lot of standard option folks are finding on some of the junkyard mods with SR5 components... The SR5 cluster just requiring a different oil pressure sending unit, etc. The stock speaker systems are easily swappable w/ SR5 components, etc (though I don't think there's wiring for rear compartment speakers unless the SR5 package was ordered however).
But to the options and whatnot by year, I find the sales brochures super informative: http://www.toyotareference.com/truck

Last edited by RSR; 08-18-2013 at 06:50 PM.
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Old 08-18-2013, 03:37 PM   #14
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Thanks guys, mystery solved. My tire treads are almost gone so I'll buy some 31's in the near future.
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Old 08-20-2013, 09:23 AM   #15
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Quote:
Originally Posted by fdp101452 View Post
My door jamb info looks just like yours, however, I have 456 g254 gears and 31s. I was told that they imported our trucks with smaller tires because the tariff was cheaper and installed larger tires after they got here. I dont know that for sure, thats what a dealer told me. He also told me they imported all of our trucks without ac and installed it over here to save money. Mine is a 90 sr5 v6. I was also told that mine wasnt imported as an sr5, that most of the add ons was done here and that kinda makes sense looking at the door info and I know mine was sold new with 31s. He told me that most trucks were imported as base models because of the cheaper tarriff, and basically remanufactured here. That would explain the door info being right on the gears and wrong on the tires. Im not putting this out as gospel, this is what a dealer who is a friend of mine told me. Hope this helps.....
That's good info. My 90 SR5 came with every option EXCEPT air. Couldn't figure out why they would load it up with everything except air but the tax situation explains it. It also came with 31's but the sticker says 28's.
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