Speedometer correction?

**NE4X4** · 05-12-2009, 01:14 PM

I'm finally getting around to correcting my speedometer. I found a company ( Dakota Digital ) that has sells a correction unit for about $80, thats pretty cheap! I was wondering if anyone has had any experience with this brand. Tell me what brand you reccomend and why. Thanks in advance for your response.

**Apex** · 05-12-2009, 01:16 PM

If you mean correcting the speedo due to new gears and tires, then you just need a Speedometer Gear. Not a correction unit

**NE4X4** · 05-12-2009, 01:22 PM

My 03 doesn't use a gear, it has a speed sensor on the transfer case that sends an electrical signal to the computer, which counts the impulses and registers the speed on the speedometer. The correction therefore must be done electrically.

**brunosplace** · 05-12-2009, 01:22 PM

Quote:

Originally Posted by NE4X4

I'm finally getting around to correcting my speedometer. I found a company ( Dakota Digital ) that has sells a correction unit for about $80, thats pretty cheap! I was wondering if anyone has had any experience with this brand. Tell me what brand you reccomend and why. Thanks in advance for your response.

I have it, and have had no troubles with it. Model SGI-5. I needed it due to the Extreme Short SYE I installed, I no longer have a speedo gear. It looks like you have a Rubicon (or at least the parts from one.), so you are in the same situation.

**Apex** · 05-12-2009, 01:23 PM

Quote:

Originally Posted by NE4X4

My 03 doesn't use a gear, it has a speed sensor on the transfer case that sends an electrical signal to the computer, which counts the impulses and registers the speed on the speedometer. The correction therefore must be done electrically.

good to know. Learning something new everyday.

BlueFlame · 05-12-2009, 03:01 PM

My 03 also has a speed sensor that sends pulses to the ECM, but it still has a pencil gear inside that turns the speed sensor. If your profile is correct, so does yours, as do all TJs except Rubies. (unless you swapped in a Rubi case and didn't update your profile.)

**ziaholic** · 05-12-2009, 03:05 PM

I've been researching this myself, and there are 2 ways to get it done.

1) You can fake out the computer by using a box like the OP posted. (and there are other fake-out boxes too, like SuperLift's unit ... but it's a little more pricey)

2) You can re-program the computer using a SuperChips unit that up until recently didn't exist for later TJ's.

I chose the latter (#2). It's a little more pricey, but I'll be able to do more things with it (like look at codes, and tweak other things)

They only recently came out, and my unit will be one of the first 10 units that my local 4WD Parts store receives. I'll probably pick it up in the next day or 2. They list for $380.

**NE4X4** · 05-12-2009, 07:01 PM

I do have a Rubicon, so no gear. Still hope someone out there has some info on this issue. As I said, Dakota Digital, makes one and I think there is one call "Truspeed" as well. Just wondering if anyone has had any experience with any of these devices.

**brunosplace** · 05-12-2009, 07:08 PM

Quote:

Originally Posted by NE4X4

I do have a Rubicon, so no gear. Still hope someone out there has some info on this issue. As I said, Dakota Digital, makes one and I think there is one call "Truspeed" as well. Just wondering if anyone has had any experience with any of these devices.

Read my post above. I said, I do have and use the Dakota Digital SGI-5 on my TJ, it works just like it is supposed to.

TJWolf · 05-12-2009, 07:08 PM

I have been doing some research as well to fix my speedo and the Superlift seems to be very popular and has some good reviews. the Dakota Digital has also been reported to be a little flakey so I am a little cautious about it... Big concern with a flakey fake-out box is when it reports you going too fast, your ECM's speed limiter kicks in causing fun times :3

Mulie · 07-21-2009, 10:04 PM

I have a 2004 Rubicon and also need to correct for gear and tire changes. I purchased the Superchips Jeep FlashPaq #3875 thinking that it would address the speedo issue and also provide additional features such as override the 4lo requirement to lock the diffs. The FlashPaq can not address either of these items on the 2004 Rubicon. Here is an email I received from Superchips customer service:

"Okay here is the scoop on these things.
Axle Lock is only something that exists on the 2007 and up JK's it's not a matter of if this vehicle has the actual components but how axle locking is done. It lacks the electric module for us to send a message and lock them from the tuner, specifically a gateway module that communicates. As far as the tire size goes, 2005 to 2006 TJ Rubicon’s are the only vehicles that we are able to correct their speedometer using the tuner."

I am disappointed that the Superchips FlashPaq can not address my issues. It does allow me to mess with the tuning and to read codes so I guess I will keep it.

Now I am looking for an electronic box to correct the speedo. I am reading about a device called Speedo Healer designed for motorcycles, but looks like it may be able to work on the '04 Rubicon and it really has some nice features. I will call and see what I find out.

KKiowaTJ · 07-21-2009, 11:09 PM

Quote:

Originally Posted by NE4X4

I do have a Rubicon, so no gear. Still hope someone out there has some info on this issue. As I said, Dakota Digital, makes one and I think there is one call "Truspeed" as well. Just wondering if anyone has had any experience with any of these devices.

You can also use a DRB III mopar computer and recalibrate it to the tire size. Sometimes a good snap-on will do it. But you are maxed out at 35's by recalibrating, If you go bigger then look into a tru-speed or something. Good luck

michaelc · 07-24-2009, 01:11 PM

I have a 06 TJ Rubicon and installed 33" tires and bought a superchips 3875 that would not recalibrate
the speedometer. Called superchips, they told me they were working on the problem, about 40% of
05 & 06 Rubicons there programer will not work on. After 6 weeks of waiting, I'm trying to get my money
back. Went to the Jeep dealer yesterday, Had them try to recalibrate the speedometer, after several trys
they couldn't. Now i'm looking for something to go between the sender and computer. Any one who has same problem?

GOTROX · 07-24-2009, 01:49 PM

Quote:

Originally Posted by NE4X4

I do have a Rubicon, so no gear. Still hope someone out there has some info on this issue. As I said, Dakota Digital, makes one and I think there is one call "Truspeed" as well. Just wondering if anyone has had any experience with any of these devices.

I have a True Speed and it works great on my 2004 Rubicon.

It has two settings as well. That way if you have Summer/Winter tires of different sizes, you just flip a switch.

Fairly easy install if you are not afraid of wiring.

aaronmjr · 09-07-2010, 01:40 PM

Hey guys, I need a little hand holding. I'm buying 30 inch tires next week and was looking into which speedometer gear I need to get. Their overall diameter is 29.8 inches. According to this site with a stock XJ (3:55 gearing, right?) I need the 33 tooth gear (part# 52067633)

http://go.jeep-xj.info/HowtoSpeedoGears.htm#chart

But this site says I should be getting the 31 tooth gear (part# 52067631)

Jeep/Dodge Speedo Gears

Thoughts?

07-24-2009, 01:11 PM	#13
michaelc Registered User Join Date: Dec 2007 Location: reno,nv. Posts: 1 Profile Gallery Classifieds My Jeeps	I have a 06 TJ Rubicon and installed 33" tires and bought a superchips 3875 that would not recalibrate the speedometer. Called superchips, they told me they were working on the problem, about 40% of 05 & 06 Rubicons there programer will not work on. After 6 weeks of waiting, I'm trying to get my money back. Went to the Jeep dealer yesterday, Had them try to recalibrate the speedometer, after several trys they couldn't. Now i'm looking for something to go between the sender and computer. Any one who has same problem?

09-07-2010, 01:40 PM	#15
aaronmjr Registered User Join Date: Jun 2009 Location: Minneapolis Posts: 4 Profile Gallery Classifieds My Jeeps	Hey guys, I need a little hand holding. I'm buying 30 inch tires next week and was looking into which speedometer gear I need to get. Their overall diameter is 29.8 inches. According to this site with a stock XJ (3:55 gearing, right?) I need the 33 tooth gear (part# 52067633) http://go.jeep-xj.info/HowtoSpeedoGears.htm#chart But this site says I should be getting the 31 tooth gear (part# 52067631) Jeep/Dodge Speedo Gears Thoughts?