Clocking the Speedometer Gear - JeepForum.com
 
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post #1 of 10 Old 07-17-2015, 08:20 AM Thread Starter
89WhyJ
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Clocking the Speedometer Gear

I'm replacing my speedo gear this afternoon (when Santa in the brown truck shows up), and I've got a question about clocking the gear. Most instructions I've seen say that you line up (rotate) the numbers on the adapter to the bump on the transfer case. I looked at my transfer case the other day, and there is no bump to line up with. The only other explanation I've seen says to line up the correct numbers on the adapter to the 6 o'clock position (towards the ground). Is this second explanation correct? I'm going to a 37 tooth gear, so I line up the set of numbers on the adapter (that covers 37) towards the ground? Thanks!

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post #2 of 10 Old 07-17-2015, 08:36 AM
Randonexplosion
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Take note of how it is currently oriented. What direction is your current set of numbers pointing?


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post #3 of 10 Old 07-17-2015, 09:14 AM Thread Starter
89WhyJ
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Good point. I'll have to look. I don't know if I can trust it though, since I think the PO monkey'd around with it. I believe the PO pulled the speedo cable at some point and didn't install it properly. So I don't know if he messed with the adapter as well.
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post #4 of 10 Old 07-17-2015, 09:23 AM
Randonexplosion
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Does your speedometer work currently? Worst case you install it, it doesn't work so loosen it back up and rotate it until it works...


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post #5 of 10 Old 07-17-2015, 10:17 AM
jokerchief462
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It won't work if the plastic (blue) gear is messed upon the T-Case output shaft in the tail one.

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post #6 of 10 Old 07-17-2015, 11:17 AM Thread Starter
89WhyJ
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I took off the cable the other day and put a drill on it, and the speedometer does work. I figure when I swap the gear out, I'll able to check it out entirely. I just wanted to be sure when I put it back together, I do it properly.
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post #7 of 10 Old 07-19-2015, 07:47 AM
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When I did mine I jacked up the rear end and supported the axle,removed the adapter and took the "o" ring off so it will rotate easier when put back in the case.With the Jeep in gear slowly rotate the tire by hand while turning the adapter until the gear is seated put a line on the case and adapter with a marker,put the "o"ring back on and while rotating the tire line your marks up and lock it down.
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post #8 of 10 Old 07-19-2015, 09:30 PM
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Quote:
Originally Posted by jokerchief462 View Post
It won't work if the plastic (blue) gear is messed upon the T-Case output shaft in the tail one.

Sent from underneath my Jeep
That blue plastic gear you mention will be on an SYE T case shaft, the stock shaft will have a steel speedo gear cut into it.

Original steel/cut gear first photo, on original shaft. Second photo, blue plastic gear on SYE shaft.






89WhyJ, you're getting the right kind of advice on clocking your new gear. Two different type speedo gears in YJs, there is a long shaft version and a short shaft version. I can't remember what your year would use (I'm thinking long shaft version) hopefully you got sent the correct gear type for your application.

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We will be going Metric every inch of the way.
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yes I'm a some guy and have always put gasket sealer on my surfaces before mating
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You should go to Pirate. I hear they are real smart over there. You'd fit right in.
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post #9 of 10 Old 07-20-2015, 06:59 AM Thread Starter
89WhyJ
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Quote:
Originally Posted by Opihi59 View Post
That blue plastic gear you mention will be on an SYE T case shaft, the stock shaft will have a steel speedo gear cut into it.

Original steel/cut gear first photo, on original shaft. Second photo, blue plastic gear on SYE shaft.

89WhyJ, you're getting the right kind of advice on clocking your new gear. Two different type speedo gears in YJs, there is a long shaft version and a short shaft version. I can't remember what your year would use (I'm thinking long shaft version) hopefully you got sent the correct gear type for your application.
Yeah, I made sure to order the long shaft gear. So I got it apart Saturday morning, and swapped the gear out. I marked the current position of the adapter and then installed my 37 tooth gear. I started with the correct set of numbers pointing down, 6:00 position...where the adapter was positioned before I started. I ran out to grocery store with my phone's GPS speedometer app, and not only did the speedometer now work, it was dead on. I have no idea what the PO did that would make the speedo stop working. But it's so nice to not be tethered to my phone every time I go for a drive. Thanks for all the help everyone!
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post #10 of 10 Old 07-20-2015, 11:14 AM
Opihi59
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Quite likely he had it clocked wrong.

....I'm not smart, but I can lift heavy things.......

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Quote:
Originally Posted by Brian4.2 View Post
We will be going Metric every inch of the way.
Quote:
Originally Posted by 40dog View Post
yes I'm a some guy and have always put gasket sealer on my surfaces before mating
Quote:
Originally Posted by Virjeep View Post
You should go to Pirate. I hear they are real smart over there. You'd fit right in.
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