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Old 08-04-2012, 10:01 AM   #31
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Thanks for the write up. It took less than 5 minutes to change out and was about the easiest thing I have done I the TJ short of dropping it of and letting someone else do the work.

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Old 10-12-2012, 03:16 PM   #32
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Stumbled upon this looking for something else. I couldn't figure out why everyone else was driving so slowly. Realized it was my new tires, felt like a dumbass. Since my epiphany, I've been using my GPS to gauge my speed.

Now I know how to fix the problem. Thanks!

Also of note, it looks like it's easy to verify that the drive housing in the correct position as long as the numbers you want are directly "over" the gripping tab of the wishbone clamp:


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Old 12-22-2012, 01:17 PM   #33
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Position of Housing with New Gear

I have a 2006 Wrangler with 31 inch tires and have not yet swapped the speedo gear. The stock tires I had on it were 225/75r15, which are ~28in if I am correct. Having a 3.73 gear ratio with 28 inch tires would be 36 teeth, and with the 31 inch tires is 33 teeth. So, to simply matters, the clocked position of 32-38 at the 5 o'clock position will not change with the installation of the new gear? I will place the housing back in the same position it was in, just with the new gear? Thank you so much!
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Old 12-23-2012, 12:16 PM   #34
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Without having to take it out and look, does anyone know if I would need a short or long shaft gear? Have an "03 Sahara with a D44 and 3.73 gear ratio. Found a good price on the gears but they offer both the short and long shaft as was not sure which one to get???

Here they are online for $40...
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Old 12-23-2012, 01:40 PM   #35
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Quote:
Originally Posted by dropzone View Post
Without having to take it out and look, does anyone know if I would need a short or long shaft gear? Have an "03 Sahara with a D44 and 3.73 gear ratio. Found a good price on the gears but they offer both the short and long shaft as was not sure which one to get???

Here they are online for $40...
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All factory Jeep TJ 231j transfer cases take a short shaft.
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Old 12-23-2012, 07:07 PM   #36
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Thanks!

Should have expected that it would be pretty cut and dry since the question was not asked previously.
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Old 12-23-2012, 07:46 PM   #37
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Thanks!

Should have expected that it would be pretty cut and dry since the question was not asked previously.
No worries. Good question.
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Old 01-06-2013, 04:22 PM   #38
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Sub'd for future reference. I get my 33's Thursday and will be needing a new speedo gear soon.
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Old 01-07-2013, 03:36 PM   #39
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Just ordered mine and a new O ring.
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Old 01-29-2013, 03:46 PM   #40
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Will replacing the speedo gear help increase MPG?
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Old 01-29-2013, 03:51 PM   #41
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Awesome post. I know for a fact I would have missed the gear number on the housing! Thanks i am sure you saved me time and anguish!
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Old 01-29-2013, 10:35 PM   #42
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Originally Posted by hickdubious View Post
Will replacing the speedo gear help increase MPG?
The speedo gear only is there to tell you your true speed. Swapping it out will absolutely not increase your MPG's, but it will tell you your real MPG's.

Without swapping the gear you are not getting a correct MPG reading on your Odometer.
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Old 02-19-2013, 07:07 PM   #43
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This post is super helpful, the only way to make it easier is for you to do it for me!
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Old 02-19-2013, 07:31 PM   #44
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This post is super helpful, the only way to make it easier is for you to do it for me!
Sorry, gas to IA would kill my jeep money.
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Old 02-28-2013, 03:32 PM   #45
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Question

[QUOTE=distortedtj;2615886]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.



So this will NOT work if you have a JK or the RUBICON version of the TJ? Just want to clarify this....I saw it won't work for a JK but seemed to miss the RUBICON...
I have an 06 Rubicon manual transmission...


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Old 02-28-2013, 04:47 PM   #46
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Quote:
Originally Posted by Sinister6 View Post
So this will NOT work if you have a JK or the RUBICON version of the TJ? Just want to clarify this....I saw it won't work for a JK but seemed to miss the RUBICON...
I have an 06 Rubicon manual transmission...
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Correct. The Rubicon does NOT use a speedo gear in the t-case tail housing. To correct the speedo with a rubi t-case you will have to purchase a programer to recal it or have a dealer reflash the computer to correct it.

"Tru-speed" I believe it is called made by superlift is a decent speedo recalculator.
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Old 03-08-2013, 08:56 PM   #47
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Does anyone know if there are numbers on speedos that are cable not electronic? I don't know what to turn it to
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Old 04-16-2013, 10:01 PM   #48
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let's bring back a dead thread....

I just bought a 1993 jeep wrangler with a 4.0l with 35" tires and 4.11 gears. I wondered if my speedo gear was swapped out so I crawled under it and yanked the gear out. Turns out it was changed to a number 35; this doesn't line up with the chart though.



How will this affect my current millage and mpg? Should I swap it for a 34? When I used my gps and compared it to my speedometer I am going 1.11 miles for ever 1 mile shown on the speedo.

Thanks!
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Old 04-17-2013, 12:16 AM   #49
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Originally Posted by MissingMyYj View Post
let's bring back a dead thread....

I just bought a 1993 jeep wrangler with a 4.0l with 35" tires and 4.11 gears. I wondered if my speedo gear was swapped out so I crawled under it and yanked the gear out. Turns out it was changed to a number 35; this doesn't line up with the chart though.



How will this affect my current millage and mpg? Should I swap it for a 34? When I used my gps and compared it to my speedometer I am going 1.11 miles for ever 1 mile shown on the speedo.

Thanks!
Actually i have 4.10 gears in the rear
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Old 07-16-2013, 02:05 PM   #50
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How does one know if you need a short or long shaft version of a speedo gear??
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Old 07-20-2013, 01:23 PM   #51
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Quote:
Originally Posted by RevCo666 View Post
How does one know if you need a short or long shaft version of a speedo gear??
Year and model of the T-case.

ALL TJ np231j cases use a short shaft.
All TJ rubicon np241 do NOT use a gear driven speedo. But a tone ring. You must have a dealer reprogram the comp to the correction or use a aftermarket programmer to adjust it yourself. "i'd use the programmer'.
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Old 07-20-2013, 03:56 PM   #52
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Year and model of the T-case.

ALL TJ np231j cases use a short shaft.
All TJ rubicon np241 do NOT use a gear driven speedo. But a tone ring. You must have a dealer reprogram the comp to the correction or use a aftermarket programmer to adjust it yourself. "i'd use the programmer'.
So in my case I'm looking at a short shaft version? 2001 TJ
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Old 07-20-2013, 09:58 PM   #53
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So in my case I'm looking at a short shaft version? 2001 TJ
Yes Sir.
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Old 07-20-2013, 10:20 PM   #54
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Yes Sir.
Thanks for clarifying that! I know running 31's is messing my milage readings but its always better to be accurate non the less. I'll check at parts store for prices since everywhere else seems to want to charge me 25$ for shipping and up for a 40$ part online.
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Old 07-23-2013, 11:15 AM   #55
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Ok, this is interesting........there is no speedo gear tooth count listed for my set up. I have (according to my vin) a 3.07 axle ratio and I'm running 35's. Any ideas on which one I need?
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Old 07-23-2013, 12:03 PM   #56
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Ok, this is interesting........there is no speedo gear tooth count listed for my set up. I have (according to my vin) a 3.07 axle ratio and I'm running 35's. Any ideas on which one I need?
Your PO had to have regeared if your running 35s on 3.07. I have 33s on 3.73 and its a bit sluggish!
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Old 07-23-2013, 12:22 PM   #57
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Your PO had to have regeared if your running 35s on 3.07. I have 33s on 3.73 and its a bit sluggish!
Maybe not.........I think mine is a bit sluggish too.
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Old 07-23-2013, 01:43 PM   #58
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put your transfer case in neutral. jack up the rear end of your jeep. Spin your rear tire around once and count the number of times the drive shaft spins. That will roughly tell you what gears you have
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Old 07-23-2013, 03:18 PM   #59
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How do I tell which speedo gear I need to compensate for the larger tires (315/70-17)
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Old 07-23-2013, 03:22 PM   #60
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How do I tell which speedo gear I need to compensate for the larger tires (315/70-17)
There is a chart floating around somewhere. You have a TJ correct? Also what gears do you have in the diffs?

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