New Gears Speedometer Way Off

[Karl]

Hi guys. I just had my 4.56 gears install on my 3 speed automatic with 35's. My speedometer is WAY off and thus I believe my odometer count is going up faster as well?

I only drove it home (1.5 hours tho!).

I have some questions.

1. My Speedometer says I'm doing 140km/h(87mph) when I'm doing like 110 km/h(68mph). That's 22% faster than I actually am going Does this mean my odometer is going up 22% faster as well? I guess what I'm asking is are the speedometer and odometer linked?

2. What is the best way to fix this? Doing calculations for a new speedo gear? Or can I just use one of those "Healtech, Speedohealer" rigs. It seems really easy but it also seems like the next person who buys the jeep would be a little suspect of something that essentially modifies the speedometer. Also what are the chances it breaks? I guess you would notice if it did cause your speedometer would tell you your going wacky speeds?

3. Does my fuel consumption go up with higher gears? I also feel like this is the case. It would appear I'm sitting right at 3k rpm when doing 110 kmph (68mph).

Thanks

 

[MountaineerTom]

You just need a new speedo gear.

 

[Karl]

You just need a new speedo gear.

Speedohealer looks like I can do it myself in 5 minutes. Are they shady or what? A speedo gear seems like The transfer case has to be opened and such. And With diffs and transfer cases I'm paying someone to do that... which would be more expensive

 

[MountaineerTom]

https://wranglertjforum.com/threads...ometer-after-changing-tire-sizes-or-gears.83/

 

[MountaineerTom]

Speedohealer looks like I can do it myself in 5 minutes. Are they shady or what? A speedo gear seems like The transfer case has to be opened and such. And With diffs and transfer cases I'm paying someone to do that... which would be more expensive

I may be wrong, but I think the speedohealer thing is for ‘03-‘06 Rubicon’s only.

 

[MountaineerTom]

I’ve not replaced a speedo gear, but it seems pretty easy if you have any mechanical ability.

 

[Karl]

I may be wrong, but I think the speedohealer thing is for ‘03-‘06 Rubicon’s only.

No Looks like Speedohealer an be for whatever you order it for frankly. But thank you for that thread. I didn't find it on my initial search. Looks easy and makes me wonder why speedohealer exists for a jeep...

 

[MountaineerTom]

Rubicon’s need it because the speedometer is electronically controlled.

 

[Airjunky]

Doing the gear in the TC is very easy. Maybe a 5 minute job.

Just have to figure out which one gear to buy.

 

[Karl]

Doing the gear in the TC is very easy. Maybe a 5 minute job.

Just have to figure out which one gear to buy.

Already ordered it haha thanks!

 

[LuvmyTJ's]

When folks say 5 minute job there not lying....easy peasy.

Just be glad you have a tj and not a jk or jl that requires a 200+ dollar device(tazer) to recalibrate the speedometer...gotta love the simplicity of our Jeep's. I'd take a mechanical fix over a computer fix any day of the week.