Speedometer correction - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-17-2012, 04:47 PM   #1
Supporting Member

WF Supporting Member
 
dezertdirt's Avatar
 
Join Date: Nov 2011
Location: La Crescenta, CA
Posts: 56
Speedometer correction

I just ordered a DPG super-ultimate lift kit and will getting new 33 inch tires once I get it installed. From everything I've been reading, there is strong suggestion that I should consider 4.88 gears in place of the stock 4.10 in the Rubicon because of the very low OD ratio in the 42RLE transmission. My question is; what are the options for speedometer correction if I change gears, or even if I don't.

I've read about Speedohealer and saw something about Superchips Flashpaq, but I can't tell if either are CARB approved here in California. Any help would be greatly appreciated. Thanks.

__________________
2005 Unlimited Rubicon, 2.5" OME, JKS UCAs & LCAs, Currie AntiRock
2008 Dodge 3500 4x4
67 Baja Bug
dezertdirt is offline   Quote Quick Reply
Old 03-17-2012, 07:20 PM   #2
Jeeper
 
Join Date: Feb 2012
Posts: 25
I dont think you can reprogram your speedometer .... i think you will have to do it the old fashion way and change the speedo gear ... Quatratec has a chart that helps you choose the correct one for you tires and gears.

MarksLj is offline   Quote Quick Reply
Old 03-17-2012, 07:36 PM   #3
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 29,233
Images: 2
The Rubicon is a different beast, it does not use a speedometer gear... its speedometer is totally electronic. The dealer can reprogram it for somewhat bigger tires and I think 33" is in their ability.

OR, buy an electronic speedometer calibrator like a Superlift Truspeed or Dakota Digital which is spliced into the wiring from the sender at the t-case. Dakota Digital is at Universal Speedometer Signal Interface

Once you have one of those, you can recalibrate the speedometer to whatever tire and axle ratio you're running, as often as you want.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 03-17-2012, 08:38 PM   #4
Supporting Member

WF Supporting Member
 
dezertdirt's Avatar
 
Join Date: Nov 2011
Location: La Crescenta, CA
Posts: 56
Jerry,
Changing gears is probably going to effect the speedo more than the tire change (going from 4.10 to 4.88). If I've done my calcs right, the combo of 33's + 4.88's should result in the speedo being low by about 5 mph. Do you think the dealer could fix this with the program? Or do you think the better bet is to use one of the aftermarket devices you suggest.

I was going to go with the FlashPaq, that claims to be able to handle this and there are at least a few wesites saying its CARB approved, but when I checked the CARB EO's, the unit that supports the Jeep 4.0 isn't listed (its supposed to be EO D-330-9). It figures
__________________
2005 Unlimited Rubicon, 2.5" OME, JKS UCAs & LCAs, Currie AntiRock
2008 Dodge 3500 4x4
67 Baja Bug
dezertdirt is offline   Quote Quick Reply
Old 03-17-2012, 09:00 PM   #5
I like Jeeps...

WF Supporting Member
 
jeepwayoflife's Avatar
 
Join Date: Nov 2011
Location: California
Posts: 2,741
Eek
__________________
--------------------------------------------------------
Take it out and play with it
Drive it like you built it
jeepwayoflife is offline   Quote Quick Reply
Old 03-17-2012, 09:12 PM   #6
Supporting Member

WF Supporting Member
 
dezertdirt's Avatar
 
Join Date: Nov 2011
Location: La Crescenta, CA
Posts: 56
I meant to say the speedo would read higher than actual speed by 5 mph at 70.
__________________
2005 Unlimited Rubicon, 2.5" OME, JKS UCAs & LCAs, Currie AntiRock
2008 Dodge 3500 4x4
67 Baja Bug
dezertdirt is offline   Quote Quick Reply
Old 03-18-2012, 01:25 AM   #7
Jeeper
 
JCROSS's Avatar
 
Join Date: Aug 2011
Location: Kelso Wa.
Posts: 482
Images: 1
I bought a speedo healer for my bike and hated it. i replaced it with a speedo DRD
JCROSS is offline   Quote Quick Reply
Old 03-18-2012, 06:23 AM   #8
Jeeper

WF Supporting Member
 
f9k9's Avatar
 
Join Date: Sep 2011
Location: London, KY
Posts: 149
I've been running a Yellr Box for several years. It's another alternative for the Rubi.
Official home page of the Yellow Box Speedo Recalibrator

__________________
"For those who have fought for it FREEDOM has a taste that the protected will never know."

03 Rubicon with a few changes.
f9k9 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
AEV Geometry Correction Front Control Arm Drop Brackets gluestick JK General Discussion Forum 120 04-03-2013 11:21 AM
Tj coil correction kit MUDRUNNER AZ Builders Corner 36 09-06-2012 10:45 AM
2.5" lift, will it need vibe correction? I-Want-A-Jeep TJ General Discussion Forum 17 03-16-2012 04:21 PM
Speedometer quit Unionmillwright26 YJ Tech Forum 3 03-16-2012 04:14 AM
speedometer issue davenfg182 JK General Discussion Forum 4 03-08-2012 08:41 PM



» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 10:45 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC