Changed Speedometer Gear...still way off (the other direction!) - JeepForum.com

 
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post #1 of 4 Old 07-02-2013, 10:21 AM Thread Starter
StanF
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1995 YJ Wrangler 
 
Join Date: Feb 2013
Location: Austin
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Changed Speedometer Gear...still way off (the other direction!)

Changed to 32" tires (BFG ATs) with my stock 4.10 gears, and using the chart here, determined that I needed a 36 tooth gear:

http://www.quadratec.com/jeep_knowle...article-46.htm

Bought one, installed it, but now my Jeep appears to read about 5mph over the correct speed at 65mph. I verified this by driving next to a friends car, and by timing between mile markers. So my speedometer reads 70 when I'm going 65mph. I checked a few other online speedometer charts, and they all seem to say 36 teeth for my situation.

I was a little disappointed, as at first I thought the speedometer gear was some magically performance upgrade!

Has anyone else seen this issue? If 36 isn't the right number, what would be? I hate to keep buying gears!

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post #2 of 4 Old 07-02-2013, 10:29 AM
pasinbuy
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1994 YJ Wrangler 
 
Join Date: Feb 2007
Location: florida
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Forget trying to check the mph by driving next to your friend or mile markers.

Borrow a GPS and check your mph that way. Then go up or down as needed.

By the chart 36 is right although remember that not all tires are the same in height and changing tires brand to brand may or will throw off the speedometer a bit.
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post #3 of 4 Old 07-02-2013, 12:00 PM
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
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Quote:
Originally Posted by pasinbuy View Post
Forget trying to check the mph by driving next to your friend or mile markers.

Borrow a GPS and check your mph that way. Then go up or down as needed.

By the chart 36 is right although remember that not all tires are the same in height and changing tires brand to brand may or will throw off the speedometer a bit.
^^^^This is the best advice you will get. Alot of 33's for instance are actually 32's

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
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. It started with a $200 axle, and a few thousand dollars later I was done :)
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diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
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this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #4 of 4 Old 07-02-2013, 12:04 PM
rage4order
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2015 JK Wrangler 
 
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If you have a smartphone, there are speedometer apps, not to mention gps apps.
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