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Old 11-03-2011, 10:59 PM
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Speedo Gear swap/change.

Easy job ANYONE CAN DO.

The speedo gear swap/change takes a mere 5 minutes and only one wrench.

Item's needed:
1/2'' wrench (socket works too).
Some paper towels or rag. (you will drip a bit of ATF)
Correct speedo gear for your tire size/axle gear ratio.
New O-ring for the drive housing. (for $3 at the dealer...change it for cheap insurance)

"optional"...a creeper....I'm not too young anymore and that cold concrete is heck on the bones.





Here is a good chart for tooth count...




Once you have everything ready locate the Speedo Gear drive on the rear output shaft of the transfer case. (easily seen from the rear of the t-case skid)





First action to take is to remove the electric connector. Push the lock clip out "the red tab" and press on the connector release and pull it off.





Next step is to remove the 1/2'' bolt and wishbone clamp from the tail housing. Set these to the side.




Once the clamp is removed you can now remove the drive housing. It will be secured tight in the tail housing..just work it back and forth until it pops out.




Now it is time to remove the old gear and install the new. To remove the old just grab the gear in one hand and the drive housing in the other...pull. It pops right out with little effort.
Pull the old O-ring off of the drive housing and install the new one.





Install the new speedo gear by pushing it into the drive sensor housing. Be careful not to pinch the o-ring when installing. (helps if you rub a bit of atf on the o-ring)


NOW...here is a little thing that a lot of people miss. The speedo gear is offset in the sensor housing. This is to adapt to different size gears. And there is 3 clocked position that you can install it. "But how do I do that?" Easy...look on the side of the drive sensor housing.
You will see the numbers....
26-31
32-38
39-45




Simply find where your speedo gear tooth number falls. When you install the unit into the rear tail housing point the number that your gear fall in down at the 5 o'clock position of the hole. Press the gear into the tailshaft.



Install the wishbone clamp and bolt to secure the drive sensor housing. DO NOT OVER TIGHTEN the bolt. The tail housing is aluminum. Just snug it down good. Don't crank on it.
Besure you set the clamp teeth into the cuts in the drive housing.




Plug the electric connector back in and you are done.



Here you will see the position that your speedo gear tooth count should be angled down. And a completed install. The installed speedo gear in this application was a 41 tooth gear...so 39-45 is down at the 5 o'clock position of the hole.



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Old 11-03-2011, 11:49 PM   #2
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Sweet write up!

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Old 11-03-2011, 11:51 PM   #3
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Are you still wrenching on this thing?
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Old 11-03-2011, 11:52 PM
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Quote:
Originally Posted by MR.CLIFFORD View Post
Are you still wrenching on this thing?
Said the pot to the kettle.
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Old 11-03-2011, 11:53 PM   #5
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Said the pot to the kettle.
Hardly. I quit wrenching on my junk years ago.
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Old 11-06-2011, 10:07 AM   #6
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Awesome write-up. Very clear and detailed. You can't get no righter!
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Old 11-06-2011, 09:44 PM   #7
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Nice write-up Tim.
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Old 11-10-2011, 07:37 PM   #8
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Nice, this is exactly what i needed. I just installed ne gears and the speedo was off by about 20mph...looked like i was going 85 when i was going 65
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Old 11-19-2011, 08:31 PM   #9
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same here steel blue 44 thanks tim for the write up
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Old 11-30-2011, 09:41 AM   #10
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Just wanted to say "Thanks" to distortedtj for this write up. I just swaped my Speedo Gear this morning right before going to work. Took me a little longer than 5 minutes (being overly cautious about things...) but not by much. Best thing about doing so is now the speedometer is "spot on" according to the GPS (unless mayhem is messing with me for not updating my GPS lol :-) ).
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Old 12-05-2011, 09:34 AM   #11
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with forums and search features there's nothing you cant find...awesome write up.

I've been 10mph off and god knows how many miles on the odometer for too long if its this easy!

Sticky! Sticky! Sticky!

who has the gears for cheapest that you all have found?
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Old 12-05-2011, 04:28 PM   #12
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Originally Posted by Kevbz
with forums and search features there's nothing you cant find...awesome write up.

I've been 10mph off and god knows how many miles on the odometer for too long if its this easy!

Sticky! Sticky! Sticky!

who has the gears for cheapest that you all have found?
The best I could find was $40 from quadratec seems a little much for a plastic gear on a metal rod
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Old 12-05-2011, 06:22 PM
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For this gear I was in a hurry to get it and just stopped by the dealer. $80 for the gear and two O-rings.

Best price is going to be about $40 or so from different online stores. Google can help with the search if you click on the "shopping" tab at the top when you search.

CHEAPEST...is stop by a transmission shop...they usually have a box or two of random speedo gears layin on a shelf. Just inspect the gear for any damage and you should be fine. I'm bought many different speedo gears from different tranny shops but you may have to search at a few to find one you need. You can usually get them for 10 to 20 bucks a piece.

NOTE: always make sure you have the correct length shaft for the speedo gear. There is a short shaft and long shaft gear.
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Old 12-06-2011, 08:59 PM   #14
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great writeup!
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Old 12-29-2011, 10:33 PM   #15
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Just changed my gear today. Took less than five minutes. Didn't need to disconnect the electrical plug but did follow the remaining directions.

Speedo is now accurate. Thanks again!
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Old 12-31-2011, 02:34 PM   #16
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Great write-up!

Will this work for JKs as well?

My dealer says my only option for my '07 JKU is to buy a $200+ hand heald computer to calibrate my speedometer (wtf?)
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Old 03-20-2012, 08:44 PM   #17
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So to make sure... I have an 04 Auto i6. I have D35 in the back, from what I have read and stuff i should have 3.07s right? I just want to make sure i get the right speedo gears. I'm running 33s, doing a long trip soon. I want to make sure I have the correct mileage and speed
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Old 03-20-2012, 11:57 PM
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Quote:
Originally Posted by Beastmaster View Post
Will this work for JKs as well?

My dealer says my only option for my '07 JKU is to buy a $200+ hand heald computer to calibrate my speedometer (wtf?)

Sadly....no you can't swap a speedo gear in the JK's. They use a electronic signal sent to the PCM via a tone ring. You option is a programer inline or a PCM flash from the dealer to correct the speedo. Programers are everywhere for them and best option if you ever change tire size again.


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Originally Posted by htkrph View Post
So to make sure... I have an 04 Auto i6. I have D35 in the back, from what I have read and stuff i should have 3.07s right? I just want to make sure i get the right speedo gears. I'm running 33s, doing a long trip soon. I want to make sure I have the correct mileage and speed
Not always. D35's came with 3.07's and 3.73's from the factory. Just look at the rear diff cover. At the 9 0'clock position there should be a metal tag. Embossed in it will be the gear ratio.
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Old 03-21-2012, 12:50 AM   #19
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Sadly....no you can't swap a speedo gear in the JK's. They use a electronic signal sent to the PCM via a tone ring. You option is a programer inline or a PCM flash from the dealer to correct the speedo. Programers are everywhere for them and best option if you ever change tire size again.




Not always. D35's came with 3.07's and 3.73's from the factory. Just look at the rear diff cover. At the 9 0'clock position there should be a metal tag. Embossed in it will be the gear ratio.
so depending on which gear i figure out i have i will either need a 31 or a 26 speedo? right? i did look all my tag had was a bunch of numbers.. couldnt make anything of it.
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Old 03-21-2012, 02:57 AM
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What are the numbers?

I can read them. Or post a photo that I can see the numbers in.

Easy to read though...you will see 307 or 373 on the tag.

And yes depending on the gear ratio will determine the gear tooth count.

33's and 3.73's = 31 tooth gear.
33's and 3.07's = 26 tooth gear.

Here is a photo showing the location of the numbers on the diff tag....

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Old 03-21-2012, 08:38 AM   #21
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found it. 3.73s. half of the first 3 was hiding underneath the bolt and dirt.
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Old 03-21-2012, 10:01 AM   #22
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found it. 3.73s. half of the first 3 was hiding underneath the bolt and dirt.
nobody in the local st marys county area has one. sucks, found i have a 36 tooth gear. oh well hopefully i find it soon
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Old 04-06-2012, 07:27 PM   #23
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Thanks for this write up. I just changed mine to a 33 tooth gear and now I am spot on (verified via GPS).
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Old 04-07-2012, 11:06 PM   #24
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Did mine yesterday... 39 tooth is DEAD ON up to 60.... 1mph off at 75mph..... GPS verified.

Running 4.56's and 33's

GREAT WRITEUP and easy to do....
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Old 04-11-2012, 12:01 AM   #25
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I have a 2006 LJ Rubicon with 4.0L 4 speed auto OD with lock up torque converter and the factory 4.11's. Runnin a 6 inch lift with 315/75/16's and the dealer told me only way to change my speedo gear was change the gear cluster on the main shaft of the transmission. Although, my dealer also told me they didn't and would'nt work on my Jeep...rather me take it to a Jeep specialst. So...will this mod gear change work on my Jeep with the auto trans, or is it only valid on the stick shift 5 and 6 speeds? Also had 4 wheel parts sell me a power programmer, that was suspose to increase my power and change the speedo gear for the larger tires...needless to say, it did nothing of the sort. Thanks much!!
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Old 04-14-2012, 05:02 PM   #26
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Best prices I found are here: Jeep Speedometer Gears for Wrangler TJ, YJ, Cherokee XJ, Grand Cherokee ZJ

Of course that would be AFTER I purchased one for $49.98 (including shipping)
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Old 05-27-2012, 11:57 PM   #27
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Old 06-08-2012, 12:26 AM   #28
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Just changed mine tonight, didn't even know I could fix it myself until this thread!

One question, did everybody else lose a good amount of ATF during their change? I only ask 'cause I did and I never really saw anyone comment about it. Just checking.

Thanks!
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Old 07-17-2012, 09:00 AM   #29
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I only lost a drop or two. Hmmm. Anyways OP thank you for posting this. I didn't know about the rotate the housing counter clockwise thing and that was what held me up. Did what you said and bam speedo works great. Now my TJ seems like it hauls ass! Went from a 34 tooth gear to a 31 (3.55 gears with 33" BFG A/T)
Thanks again
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Old 07-23-2012, 11:51 PM
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Quote:
Originally Posted by Hiwayhunter View Post
I have a 2006 LJ Rubicon with 4.0L 4 speed auto OD with lock up torque converter and the factory 4.11's. Runnin a 6 inch lift with 315/75/16's and the dealer told me only way to change my speedo gear was change the gear cluster on the main shaft of the transmission. Although, my dealer also told me they didn't and would'nt work on my Jeep...rather me take it to a Jeep specialst. So...will this mod gear change work on my Jeep with the auto trans, or is it only valid on the stick shift 5 and 6 speeds? Also had 4 wheel parts sell me a power programmer, that was suspose to increase my power and change the speedo gear for the larger tires...needless to say, it did nothing of the sort. Thanks much!!
As noted before. The Rubicon 241 t-case uses a tone ring. You can only fix the speedo with a computer flash or programmer that has the option to adjust the speedo gear for tire size.

Quote:
Originally Posted by willybTJ View Post
One question, did everybody else lose a good amount of ATF during their change? I only ask 'cause I did and I never really saw anyone comment about it. Just checking.

Thanks!
Nope..just a few drips off of the gear.
Your transfer case fluid should only be filled to the bottom of the fill plug hole. Some shops that refill them will cram fluid in them and plug them up.

Also...were you on level ground?

Anyway it is easy to check the fluid by just pulling the fill plug and checking.

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