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Old 01-20-2020, 11:28 AM
Bad Luck Bad Luck is offline
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Bad Luck Bad Luck is offline
Senior Member
 
Join Date: Feb 2019
Location: Hot Springs, AR
Posts: 4,410
Real Name: Patrick
Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute Bad Luck has a reputation beyond repute
Quote:
Originally Posted by 4Tuitous View Post
First, my vehicle: '99 Base model, 4cyl. Auto - NON-ABS - electronic speedo.
Original tires 225/75/15 - NOW riding on 265/70/16 (optional stock size).
Speedometer reading now LESS than actual speed...about 5mph @ 60mph.
I'm not sure why you thought it would be the other way around. A larger than stock tire goes further per rotation compared to a stock tire.

Quote:
Originally Posted by 4Tuitous View Post
I came across a webpage called "Adventure Taco"...obviously an avid off-roader but also a serious numbers nerd...wow. What a load of info. But he did have a LOT of relevant stuff on there, including some other driven gear specs, and now this is what confuses me. All these driven gears identify as 33403-( ), with the second set of numbers designating tooth count. The 39415 variant is 33 tooth, the largest they make. But if my speedo is reading SLOWER than my actual speed...wouldn't a larger, more teeth gear make it WORSE? There are two other variations specified for auto trans., one 32 teeth and one 30. I do not know what is currently in my truck. Only way to know would be take it out and count 'em. Not going to buy anything until I get this sorted out. Still hoping this might be my easy fix...if not I'll have to go the SpeedoHealer route I guess. Hoping some of you who have commented are following this thread...anybody?
If you are wanting to correct it with a speedo gear change you will need to know what your current tooth count is. You will want a smaller new gear (less teeth) than the current gear so that it will spin faster. The person on Adventure Taco probably regeared in addition to larger tires and needed to correct for a speedometer faster than gps speed.
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