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-   -   Speedo Gear? (http://www.wranglerforum.com/f282/speedo-gear-151449.html)

Bama-Jeeper 04-05-2012 11:02 AM

Speedo Gear?
 
1. Im need to change the speedo gear & can't seem to figure out how to discover what the gear ratio is? I looked at the charts i've found and its somewhere between 3.55 & 5.13. I have a 4" Lift with 33's.

2. Also, when I upgrade to 35's, i've heard that "re-gearing" will be needed/helpful...what does that mean?

Please help a newb out. Always willing to learn!
--Roll Tide--:thumb:

TnDz TJ 04-05-2012 11:51 AM

http://www.higherground4x4.com/Tech_...meter_gear.htm

Lbailey21 04-05-2012 11:58 AM

Means you need $$$$$$$

TnDz TJ 04-05-2012 12:37 PM

If you really want to know... Grab 2 qts of diff lube and a tube of RTV. Pop the diff cover and read the numbers on the ring gear. Divide the larger number by the smaller number to get your ratio.

Example from ring:

41:9

41/9=4.55556

4.56 gears

Bama-Jeeper 04-05-2012 12:44 PM

Quote:

Originally Posted by TnDz TJ (Post 2223108)
If you really want to know... Grab 2 qts of diff lube and a tube of RTV. Pop the diff cover and read the numbers on the ring gear. Divide the larger number by the smaller number to get your ratio.

Example from ring:

41:9

41/9=4.55556

4.56 gears

Oh wow lol is that the only way?

TJDave 04-05-2012 12:49 PM

Is your 04 X and automatic? My 04 X is, and it came from the factory with 3.73 gears. If yours has the 42rle automatic, I don't see why it would be any different.

I found this interesting: My speedo was around 10 mph off when I moved up to 33" tires, and still had stock gearing.

Now, I have 4.88 gears, and 35" tires. I checked my speedo with a GPS and it is spot on. I did not have to change speedo gears!

Bama-Jeeper 04-05-2012 12:55 PM

No its a manual, and how expensive/difficult was it to have your diff regeared?

TJDave 04-05-2012 01:06 PM

Quote:

Originally Posted by Bama-Jeeper (Post 2223182)
No its a manual, and how expensive/difficult was it to have your diff regeared?

I had a friend re-gear mine. I gave him my old 33" tires. He is a auto-tech by trade. Watching him do it, it is not something I would want to attempt. He had some specialized tools he used.

I have heard costs ranging from $3-$600 per axle on a re-gear. One thing that always comes up is if you have a shop do it, buy the gears from them. That way if anything goes wrong, they will warranty the work, and not blame the gear set you provided.

TnDz TJ 04-05-2012 03:42 PM

TJDave is right.... if you have a shop do it ( highly recommended unless you have done it numerous times) buy everything from them so the warranty is in tact.

Cost wise.... yeah... $300-$600 per axle sounds like its in the ballpark... plus bearings and shims and seals and R&P.....

TnDz TJ 04-05-2012 03:46 PM

Quote:

Originally Posted by Bama-Jeeper (Post 2223136)
Oh wow lol is that the only way?

There are other ways...

If you jack up your rearend off the ground...

spin one wheel... if the other goes the same direction, you have Limited slip and this is easy....

1. Mark the inside of the tire at the 6 oclock position.
2. mark your rear drive shaft at the 6 oclock position.
3. Rotate your tire one full revolution and count the number of times the drive shaft goes around.

If its close to 3 times... you have 3.07s
close to 3.5 time but a little over.. most likely 3.73
4 times.... 4.11's

I can't recall how to do it with an open diff though....

Lbailey21 04-05-2012 04:11 PM

I was quoted around $650 front and rear for installation :)

Bama-Jeeper 04-09-2012 12:22 PM

Aweseome, well I preciate all the input that was given!


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