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Old 04-05-2012, 10:02 AM   #1
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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--

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Old 04-05-2012, 10:51 AM   #2
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~Todd~ 2004 X 4.0 5 speed---SOLD
4" Lift, 4.56's, 33" Duratracs on M/T Classics
RR SYE, Tatton CV, MML, BL, TT, Dynomax Exhaust
Hella Lighting: Driving, Fogs and H4 E-Codes
NOPE! ... and NEVER will be...
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Old 04-05-2012, 10:58 AM   #3
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Means you need $$$$$$$
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2006 Jeep TJ blacked out. 4" skyjacker suspension 1" daystar BL & 1in" rough country motor mount lift. fabtech front bumper, rugged ridge rear bumper. KC 130w HiLite windshield lights. 35x12.5r15 MTz

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Old 04-05-2012, 11:37 AM   #4
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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
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~Todd~ 2004 X 4.0 5 speed---SOLD
4" Lift, 4.56's, 33" Duratracs on M/T Classics
RR SYE, Tatton CV, MML, BL, TT, Dynomax Exhaust
Hella Lighting: Driving, Fogs and H4 E-Codes
NOPE! ... and NEVER will be...
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Old 04-05-2012, 11:44 AM   #5
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Quote:
Originally Posted by TnDz TJ View Post
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?
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Old 04-05-2012, 11:49 AM   #6
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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!
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Old 04-05-2012, 11:55 AM   #7
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No its a manual, and how expensive/difficult was it to have your diff regeared?
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Old 04-05-2012, 12:06 PM   #8
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Quote:
Originally Posted by Bama-Jeeper View Post
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.
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Old 04-05-2012, 02:42 PM   #9
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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.....
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~Todd~ 2004 X 4.0 5 speed---SOLD
4" Lift, 4.56's, 33" Duratracs on M/T Classics
RR SYE, Tatton CV, MML, BL, TT, Dynomax Exhaust
Hella Lighting: Driving, Fogs and H4 E-Codes
NOPE! ... and NEVER will be...
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Old 04-05-2012, 02:46 PM   #10
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Quote:
Originally Posted by Bama-Jeeper View Post
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....
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~Todd~ 2004 X 4.0 5 speed---SOLD
4" Lift, 4.56's, 33" Duratracs on M/T Classics
RR SYE, Tatton CV, MML, BL, TT, Dynomax Exhaust
Hella Lighting: Driving, Fogs and H4 E-Codes
NOPE! ... and NEVER will be...
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Old 04-05-2012, 03:11 PM   #11
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I was quoted around $650 front and rear for installation
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2006 Jeep TJ blacked out. 4" skyjacker suspension 1" daystar BL & 1in" rough country motor mount lift. fabtech front bumper, rugged ridge rear bumper. KC 130w HiLite windshield lights. 35x12.5r15 MTz

if it aint broke, fix it till it is
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Old 04-09-2012, 11:22 AM   #12
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Aweseome, well I preciate all the input that was given!

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