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Old 11-10-2015, 11:20 PM
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Speedo Issues on 2004 TJ with 5 1/2 lift and SYE

Ok guys, im new here (just been reading for the past month). I purchased my first jeep as a winter project and summer toy. The Jeep is a 2004 TJ, Auto, 4.0 with 5 1/2 inch Rustys long arm lift kit, and 35" tires. When I purchased the Jeep I knew it had issue with the lift (all the heimes joints were bad) and the Speedo was acting crazy.

Now for my main question:

Sometimes when I start the jeep the speedo pegs at 120-140 MPH and will just stay or bounce in the 100-140 range. When you are driving this will cause you to hit like a rev limiter if you accelerate fast. going down the road for a bit and all the sudden in will fall back to the real speed (matches my GPS) and the jeep runs great . I was reading something on here about the tone ring and a shim for the Rough Ridge SYE; however, I am not even sure what type of SYE I have (brand) and now an can no longer find that post.


Could anyone point me in the right direction? Is this something I can simply replace or do I need to split the transfer case?

Thanks in advance for the help and sorry about my lack of search ability as I no I have seen this on here before......

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Old 11-10-2015, 11:27 PM   #2
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You probably have one of the cheeper boxes to adjust speedo for gears and tires

No such issues with speedo healer but you pay a little more

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Old 11-10-2015, 11:45 PM
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How would I tell, where is the box mounted?

Thanks
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Old 11-11-2015, 06:56 AM   #4
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The stock system has a three wire connector at the speed sensor on the rear transfer case output ( both stock and with an SYE)

The three wires are signal,ground and plus 5 volts

The aftermarket boxes either tie in at the sensor plug or along the harness to it or up where the wires enter the PCM

The box can be mounted anywhere but the tie in is what you look for
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Old 11-11-2015, 07:02 AM   #5
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http://www.jeepforum.com/forum/f140/.../867289?page=1

Pics of an install that give an idea what to look for
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Old 11-11-2015, 08:10 AM
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Thanks, I will get this in the garage after work tonight and see what I can find. adding miles at a stop sign is killing me LOL
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Old 11-11-2015, 10:00 PM
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Well, I got the jeep back in the garage tonight and I had no luck finding any Speedo correction tied into the wiring for the Speed Sensor (and to think of it my Speedo might be off by 5MPH or so at 65). Looks like I am back to ground zero on the speedo jumping all over the place.

I am still wondering if anyone knows what brand this SYE is or how I can tell?
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Old 11-11-2015, 10:01 PM
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FYI the wires that are zip tied on are for the o2 sensor on the other side
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Old 11-11-2015, 10:13 PM   #9
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you should have a double cardan yoke and driveshaft....
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Old 11-11-2015, 10:58 PM   #10
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Looks to me like you do
Stock there is only one connector and yours looks like two in a row

If that is accurate follow the wires that leave between the 1st and 2nd connector and they will lead to a small box

To remove box from circuit as Long as both sets of connectors are same just unplug both remove middle portion and plug the far ends of each of the two current connectors together

It may be a fixed amount off but it should stop jumping around at least if the add on box is the issue
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Old 11-11-2015, 11:15 PM
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Well Looks like I might have found my issue!!!!! When I was chasing stuff down tonight I found a broken ground strap from the frame to block just under the alternator. I replaced that and took the jeep out for about a 15 mile drive and not one hiccup with the speed and it is dead on with my GPS. Lets hope that was all it was! Thanks for the help guys, I can already tell this jeep thing is going to be a lot of fun but a lot of time tinkering in the garage....
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Old 11-12-2015, 12:02 AM
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Scratch that, decided to run and fill the tank up on the jeep and 1 mile from the house the speedo Pegs 120 again..............

Guess its back the the drawing board
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Old 11-12-2015, 07:07 AM   #13
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It looks like a Tera Flex extreme SYE.
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Old 11-12-2015, 08:05 AM   #14
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Quote:
Originally Posted by unlimitedlj04 View Post
you should have a double cardan yoke and driveshaft....
x2
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Old 11-13-2015, 01:05 PM
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Quote:
Originally Posted by 00silverTJ View Post
It looks like a Tera Flex extreme SYE.
Thanks, it is a TeraFlex. I gave them a call to confirm and was able to get the speed sensor shipped overnight. Installed that and new U-Joint in the rear and wow..... almost like I have a new jeep with a working speedo that shifts right and does not vibrate.....


Thanks for the help!
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Old 11-14-2015, 05:03 AM   #16
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Quote:
Originally Posted by Cbunda View Post
Thanks, it is a TeraFlex. I gave them a call to confirm and was able to get the speed sensor shipped overnight. Installed that and new U-Joint in the rear and wow..... almost like I have a new jeep with a working speedo that shifts right and does not vibrate.....


Thanks for the help!
Glad that you got some results. But it looks like your problem might have been the result of not having a double cardon driveshaft. If so, problems could return or get much worse with a pinion, TC tail shaft or driveshaft failure.
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Old 11-14-2015, 05:27 AM
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Thanks, I was just looking at the Tom Woods.... any other recommendations
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Old 11-14-2015, 08:08 AM   #18
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Thanks, I was just looking at the Tom Woods.... any other recommendations
Tom Woods drive shafts is a good way to go.
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Old 11-14-2015, 09:53 AM   #19
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Drive shafts are the last thing that anyone has a monopoly on. There is no reason not to support your local shops to have your driveshaft made. They are made from tubing yokes and joints. there are no specialized proprietary parts or methods. Build a relationship with a local machine shop by having them build your driveshaft.
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Old 11-14-2015, 09:54 AM   #20
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To save some money get a Cherokee front driveshaft for your builder to start with.
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Old 11-14-2015, 09:58 AM   #21
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I googled-up these guys for you.

D&R Driveline Inc. | Contact | D&R Driveline Inc
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Old 11-14-2015, 09:59 AM   #22
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You may need them for other stuff in the future, or just advice.
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Old 11-14-2015, 10:30 AM
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Good call, Thanks I will check them out.
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Old 12-23-2015, 08:21 PM
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Went with the Tom Woods Double Cardan (CV) drive shaft, they were great to work with and built and shipped it out very quick. The new drive shaft did make a big improvement but man the TeraFlex mega short SYE is a pain in the butt.... You have to pull the yoke to install the bolts (not enough clearance). Lets hope I never break one in the trail.

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