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Old 05-31-2008, 01:16 PM   #1
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Speedometer gear confusion

So i'm looking to buy a speedometer gear. Well there are couple of charts i've seen. I have 3.73 gears and 35s. Some charts say i need 29 tooth gear others say i need 31 tooth gear. What is right?

http://4x4xplor.com/speedo.html



In 4wheel drives catalog (www.4wd.com) it says i need 31 tooth gear.
I just called qtec (yes i know lol) and on their website it says i need 29 tooth gear while when i called, the guy says i need 31 tooth gear. WTF is going on here?
http://www.quadratec.com/jeep_knowle...article-46.htm

Thanks

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Old 05-31-2008, 01:21 PM   #2
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what does your tire measure in diameter?... im betting its about 33''

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Old 05-31-2008, 01:21 PM   #3
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I have had decent success with this chart.

http://www.raingler.com/jeepReference/speedoChart.html

Says you need a 29. Do you know the exact height of your tire? Just cause they say 35 doesn't mean they are 35.
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Old 05-31-2008, 01:25 PM   #4
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for a 33'' diameter you need a 31 tooth with 3.73's
for a 34.5 to 35.2 diameter you need a 29 tooth with 3.73's

and before you get mad and stores and sales places....the 31 tooth speedo gear is on national back order since January

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Old 05-31-2008, 01:40 PM   #5
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my tires measure a bit over 34". I'm thinking a 30 tooth gear should be perfect for 34" tires?

I just ordered a 30 tooth gear from qtec and they say
Quote:
i should receive it in 3-5 business days.
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Old 05-31-2008, 01:45 PM   #6
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good luck
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Old 05-31-2008, 01:48 PM   #7
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LoL with my experience with qtec i will receive it for Christmas. I'm not taking the risk to order something big from them however this is 20 bucks. I can deal with that.
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Old 05-31-2008, 02:14 PM   #8
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I get speedo gears from the dealership for 8 bucks. Usually have them the next day.
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Old 05-31-2008, 02:32 PM   #9
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my dealer ship doesnt have any of them in stock and they are 25 bucks + tax
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Old 05-31-2008, 09:27 PM   #10
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I waited 2 months for my 30T gear from Jeep. $22. I too split the diff as I would rather be putting less miles than actual as opposed to putting more miles on than I travel. I have not checked it with a GPS yet, but I think it is close enough.

As you, I have 35s and 3.73. Switching the gear makes it feel much faster as the speedo moves quicker.
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Old 06-01-2008, 08:15 PM   #11
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lol, Juspinpin, honestly i have an idea however i wanna see if i'm gonna get the right mpg as what i calculated i would.
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Old 06-01-2008, 08:33 PM   #12
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it is eating you up inside isn't it?
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Old 06-01-2008, 08:44 PM   #13
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yes Mr C it is lol I still do not understand why i would get something other than what i calculated because its all about a ratio of old tire circumference to the new tire circumference or the ratio of the old gear teeth to the ratio of the new gear teeth. Now it should be different because its 30 tooth instead of 29 however it still shouldnt be that much off.
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Old 06-02-2008, 06:54 AM   #14
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Old 06-02-2008, 06:22 PM   #15
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I have a 29 tooth gear sitting in my garage if you want it.
Drop me a PM if you are interested.
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Old 06-04-2008, 02:54 PM   #16
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I just received my 30 tooth gear. Steelman i wish i knew i would have bought it from you.
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Old 06-04-2008, 03:15 PM   #17
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Quote:
Originally Posted by Triple88a View Post
I just received my 30 tooth gear. Steelman i wish i knew i would have bought it from you.
You still can, the benefit with Bob's being you'd have an accurate speedometer with his 29 tooth gear.
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Old 06-04-2008, 03:17 PM   #18
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Yes but i already have one 30 tooth at home. Dont feel like spending more...
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Old 06-04-2008, 03:38 PM   #19
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Quote:
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Yes but i already have one 30 tooth at home. Dont feel like spending more...
check your PM's...
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Old 06-04-2008, 03:48 PM   #20
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Bob you need to get at least $50 for that rare 29 tooth gear, you're not just gonna give it to him are ya?
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Old 06-04-2008, 04:04 PM   #21
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Quote:
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Bob you need to get at least $50 for that rare 29 tooth gear, you're not just gonna give it to him are ya?
He's agreed to pay $75, which will cover shipping!
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Old 06-04-2008, 04:16 PM   #22
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Nah I call BS on the $75, you're giving it him like the good guy I know you to be, aren'tcha.
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Old 06-04-2008, 04:17 PM   #23
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Old 06-04-2008, 04:37 PM   #24
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Hey BOb if Trip don't take the gear let me know.I don't know about the $75 buuuttt I would buy it Unless $75 is what you really wantThen I don't really need one that bad J/K I really do need one but mine has to be fabed26 tooth but 29 would be better than I got now.
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Old 06-05-2008, 12:51 AM   #25
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trip: get that installed, and go drive around aimlessly.. i wanna know the outcome!
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Old 06-05-2008, 01:18 PM   #26
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Sherman since i'm getting the 29 tooth, you want my 30 tooth?

Spanky today my fuel light went on again. I had 242 miles on the odometer with the stock gear.
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Old 06-06-2008, 12:25 AM   #27
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Quote:
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Spanky today my fuel light went on again. I had 242 miles on the odometer with the stock gear.
242 miles before
ok now get that new gear in and kill a tank of gas! inquiring minds want to know!
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Old 06-06-2008, 12:29 AM   #28
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lol i donno man, i've got so many mods on the list. I think i might do the gear last. I have my radiator electric fan, i wanna add a hydrogen cell, i wanna try my bumper, and at last the gear.. just adds up lol.. if i do the gear then my "base" or current mpg might be off.

I ran it up to 248.7 miles and filled up 16.505 gallons of gas.
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Old 06-06-2008, 12:49 AM   #29
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a electric fan is on my list somewhere.. i think theyre pretty cool.. haha get it ?
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Old 06-06-2008, 01:11 AM   #30
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lol we'll see how cool my pro comp will be lol

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