How do i fix my speedometer?

[Ted]

I need to get my speedometer fixed I put 33's on there and im 10mph off its already gotten me in trouble with the law. (I have a bite of a lead foot) Is there any easy way to correct it? Or a place I can bring it to get fixed

THX for your help

[Lifes A Jeep]

You need to change your speedo gear. Its a pretty easy swap.

Here's a link to Stu's website with a write up on how its done.
http://www.stu-offroad.com/engine/speedo/speed1.htm

[4 Wheelers Supply]

We stock most of the popular speedo gear replacements. Post up your gear ratio and I will look it up for you. Thanks :)

[Ted]

Im not sure I have a 99 wrangler that came stock with like 28's I think there Dana 30s im sorry im kind of a newbie

[CaptainMorgan]

I got mine from 4 Wheelers for cheap and installed in in ten minutes in the parking lot of a car wash...really easy. I suggest going to 4 wheelers because they helped me by telling me to clock it correctly. I even said I knew what I was doing, good thing they explained the install anyways:) Basically there is a little dot that you have to line up for different speedo gears, I think there are 3 different positions depending which gear you need.

[Phx Cobra]

http://www.4x4xplor.com/images/speedo/speedochart00.gif

Go to 4wheelers, tell them the number that matches up with your tire size/gear ratio and throw it in. I can do it for you. It takes like 2min.

[Phx Cobra]

It says the gear ratio on the tag on your rear diff.

[KennethS]

Assuming they are factory gears. A co-worker just put 33s on his recently purchased '93 Wrangler 4 banger, and we had to determine what gears were in it. I had him drive 60 MPH in 4th gear (1:1 ratio) and tell me what RPM he was turning so I could figure out his gear ratio. Turns out he has 4.88s in it. Made me jealous.

Oh, by the way here's the formula:
Gear ratio = (RPM x tire dia) / (MPH x trans ratio x 336)

[lancetkenyon]

http://www.4x4xplor.com/images/speedo/speedochart00.gif

Go to 4wheelers, tell them the number that matches up with your tire size/gear ratio and throw it in. I can do it for you. It takes like 2min.

Hmmmmm.........I don't see my gear ratio in there..............:rolleyes:

[Wayco]

Hmmmmm.........I don't see my gear ratio in there..............:rolleyes:

You don't need to know how fast you are going, like Joe said, your rig is unsafe at any speed...:D

[Phx Cobra]

Hmmmmm.........I don't see my gear ratio in there..............:rolleyes:

:D As well you shouldn't.

[Ted]

Thanks everyone for the help I will call Cole (4Wheelers) when I have the right Gear ratio :)

[lancetkenyon]

You don't need to know how fast you are going, like Joe said, your rig is unsafe at any speed...:D

Joe said my junk is the scariest TJ he has ever driven.......but then he drove FatBob's!;)

[TRobertsRN]

My plan is a GPS with a large display for the MPH.

As I currently have 33" tires and plan to go to 35 or 37, and in the future that could change again this seems a good idea to me.

[Wayco]

I use my GPS for that, fortunately, when I put the 35's on Hyjak, the speedometer is only slightly off with the 4:88 gears.