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Old 02-08-2009, 04:40 PM   #1
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Replaced Speedo Gear and now no speedo

Little help guys and gals,

I just replaced my speedo gear with the correct 39 tooth gear and followed the instructions, but now the speedometer doesn't work..

Can you guys give me some help here?

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Old 02-08-2009, 04:46 PM   #2
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Did you install the right gear? Itīs available with a short and a long shaft.

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Old 02-08-2009, 04:48 PM   #3
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It's been a few years since I did one, but did the gear seat all the way?

Sometimes when changing them, the new won't align with the old and you have to twist (or in technical terms; "fiddle") with it.

Pull it back out, make sure that the gear wasn't damaged or destroyed and re-seat it into the socket.
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Old 02-08-2009, 05:11 PM   #4
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Quote:
Originally Posted by stevens243 View Post
It's been a few years since I did one, but did the gear seat all the way?

Sometimes when changing them, the new won't align with the old and you have to twist (or in technical terms; "fiddle") with it.

Pull it back out, make sure that the gear wasn't damaged or destroyed and re-seat it into the socket.
The gear was damaged.. That was a nice $95 F**K UP!! MOst of these gears are $19, but mine (39 tooth) was $95.. I tried to reinstall the original one and it still won't work..

Any ideas?

Timber
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Old 02-08-2009, 05:15 PM   #5
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Only thing I can think of is that you have gear FOD (sorry, Foreign Object Damage) in there.

Maybe someone can say for SURE, but I'm fairly certain that the drive gear is steel and your gear is (or was) plastic. I think that you would be able to clean the plastic out of the drive gear with something. Hopefully, not much of it got in there and getting a piece or two out will solve that problem.
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Old 02-08-2009, 05:44 PM   #6
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Guys.. I have no idea what I could have done wrong.. I oriented the numbers as dictated by the FSM and everything.. The 39 tooth gear was just bitten a tad, but none the less rendering it useless. I attempted to reinstall the stock unit 3 times and it still doesn't work.. It seats down just fine and the number 32-38 are as they should be..

Any help is very much appreciated.

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Old 02-08-2009, 05:53 PM   #7
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No problem Timberman, you just need to rotate the speedo gear housing a tad more so the new speedo gear fully engages the pinion gear inside. I always have to rotate mine a tad more than I expect to get the gears engaged well enough and the speedometer working again after installing a new speedo gear. Did you at least start out so the housing's pointer is matched up with the correct speedo gear tooth count?
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Old 02-08-2009, 05:57 PM   #8
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Yep, you have to "fiddle" with it. You should be able to feel it seat and mesh with the drive gear.
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Old 02-08-2009, 06:05 PM   #9
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"Fiddle with it" is the perfect term for this, I need to use that term more for this kind of stuff more often.
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Old 02-08-2009, 06:16 PM   #10
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Yeah, I told him to "fiddle" in post 3. He's not fiddling enough!

Sorry for all the techno-babble!
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Old 02-08-2009, 06:40 PM   #11
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Guys,

I fiddled with the Stock one 3 times.. It appears to seat perfectly.. Obviously, I will need to order another 39 tooth and yet spend another $95, but in the interim, I will have to use the stock one (34 tooth).

The three times I have tried to reinstall the stock one, I literally pulled it out, inspected it, and reinstalled it. It is in the exact same position it was when I started this whole debacle.. Easy jobs are always the roughest for me.
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Old 02-08-2009, 06:41 PM   #12
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So, you have the stock one back in and working?
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Old 02-08-2009, 06:42 PM   #13
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Originally Posted by nicolas-eric View Post
Did you install the right gear? Itīs available with a short and a long shaft.
Yes, it is a short shaft 39 count.. It says "39" right on the outside of the gear. the whole thing is green.. Could they have given me a defective 39 tooth gear?

Every place I looked I found that with 33" tires and 4:56 gears; the tooth count should be 39..
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Old 02-08-2009, 06:43 PM   #14
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So, you have the stock one back in and working?
I have the stock one back in, but speedo isn't registering anything.
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Old 02-08-2009, 06:48 PM   #15
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i guess it would be possible to damage the gear on the t case shaft, its been a long time, but it is plastic also i believe. take out the speedo, and look at the gear in the case, spin the shaft and inspect the gear inside the case. there's no other reason i can see that the oe sensor isn't working.
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Old 02-08-2009, 06:53 PM   #16
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Did the plug get something "in there" or broken somehow?

Dave, Could the shaft on his 39 tooth have done something to the plug? Because unless something like the drive gear isn't spinning is going on, I'm outta ideas. Even with a broken tooth or two on the gear, it should at least be making the speedo register something, shouldn't it?
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Old 02-08-2009, 06:54 PM   #17
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i guess it would be possible to damage the gear on the t case shaft, its been a long time, but it is plastic also i believe. take out the speedo, and look at the gear in the case, spin the shaft and inspect the gear inside the case. there's no other reason i can see that the oe sensor isn't working.
I believe that the gear inside the housing is metal.. Could there be something with the sensor connection? Should I spray both plug connections with electronic cleaner?
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Old 02-08-2009, 07:08 PM   #18
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ya i can't believe it would register nothing. oh, i just realized you did just the gear, not the whole senosr. which is normal, i just wasn't thinking that. i bet the sensor is damaged somehow, thats the only way its gonna read nothing, even with the oe gear. make sure the pins didn't get damaged on the connector but that is unlikely. sounds like you gotta get a new sensor
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Old 02-08-2009, 07:12 PM   #19
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You aren't telling us that you have rotated the housing as suggested above to get the speedo and pinion gears engaged. Try that first... re-read the above suggestions if you didn't see them yet.
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Old 02-08-2009, 07:14 PM   #20
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Guys,

I fiddled with the Stock one 3 times.. It appears to seat perfectly.. Obviously, I will need to order another 39 tooth and yet spend another $95, but in the interim, I will have to use the stock one (34 tooth).

The three times I have tried to reinstall the stock one, I literally pulled it out, inspected it, and reinstalled it. It is in the exact same position it was when I started this whole debacle.. Easy jobs are always the roughest for me.
i am going on the basis he's convinced he's seated it right, but do make darn sure. sounds like he has this many times and getting zero reading.
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Old 02-08-2009, 07:21 PM   #21
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You aren't telling us that you have rotated the housing as suggested above to get the speedo and pinion gears engaged. Try that first... re-read the above suggestions if you didn't see them yet.
Yeah Jerry, I have done everything listed above.. It is sitting in the housing perfectly.. What I did notice is when you have the drive gear installed in the sensor, there is a little play back and forth. I popped the gear in and you can push it in flush or pull it out about 1/4 inch before it catches.. Should I have the gear in the extended position when I install it, or have it flush with the gear housing.

I really cannot tell if it is meshing with the gear inside the housing.. The gear when installed in the sensor housing spins freely whether I hold it in my hand or it is installed in the vehicle.

When I installed it the first time with the 39 tooth; I really didn't get it to seat like when i reinstalled the stock 34 tooth gear.

-Timber.
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Old 02-09-2009, 10:58 AM   #22
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I don't think you're understanding what we mean by "rotate the housing" from what you're saying. It's not the gear inside or how it is seated, we're talking about the external housing that is clamped down with the 1/2" head bolt for the exterior housing clamp you remove when you're replacing the speedometer gear inside. Loosen that outside bolt and clamp and then rotate the entire gear housing underneath that clamp until the gear meshes inside.
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Old 02-09-2009, 12:03 PM   #23
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Thanks Jerry

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I don't think you're understanding what we mean by "rotate the housing" from what you're saying. It's not the gear inside or how it is seated, we're talking about the external housing that is clamped down with the 1/2" head bolt for the exterior housing clamp you remove when you're replacing the speedometer gear inside. Loosen that outside bolt and clamp and then rotate the entire gear housing underneath that clamp until the gear meshes inside.

Jerry,

I am completely at a loss here, so I will try anything.. I searched the web all last night and this morning and I cannot seem to find anyone having the same problems that I am having.. Typical story of my life sir!!

I will give it a shot after I handle a few things in the office and I will report back.

Not all was bad yesterday.. I did find a very cool way to change your transfer case fluid without making a mess and without being forced to remove the skid.. I am not touching that skid again..
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Old 02-09-2009, 12:08 PM   #24
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Jerry,

I am completely at a loss here, so I will try anything...
What I'm suggesting you try is what I first suggested you try... if you haven't done that yet, I'd bet big $$$ that doing so will fix the problem.
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Old 02-10-2009, 06:09 PM   #25
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What I'm suggesting you try is what I first suggested you try... if you haven't done that yet, I'd bet big $$$ that doing so will fix the problem.
ok, I did as you said Jerry, but still no speedo.. This is beginning to become really frustrating because there really is only one way for this to go in given the gear i am attempting to replace. I once again removed it, jiggled it with the bolt attached, and replaced. I really couldn't feel the gears meshing, but I did feel it catch a few times... I am so at a loss here!! I really hope I don't have to pay someone to do this....

Could I have damaged the sensor? if so, how would one test the sensor?
Could I have damaged the internal gears? The gear is light blue and appears to be plastic.
Do I have to drive it a while to get the speedo gear to catch with the drive gear?

Thanks in advance for saving what little hair I have left!

Timber
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Old 02-10-2009, 06:17 PM   #26
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Could i have possibly tripped a code or something disabling the speedo?
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Old 02-11-2009, 01:13 PM   #27
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Anyone?
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Old 02-11-2009, 01:22 PM   #28
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I'd pull the speedometer gear and make sure it looks ok and reinstall it, ROTATING THE SPEEDO HOUSING more than you have so far to insure it is properly meshed with the pinion gear inside. I still believe that's your problem. This would not trip any codes that would disable the speedometer. The speedometer gear's external housing electrical connection is solid and plugged in properly, right?
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Old 02-11-2009, 01:23 PM   #29
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Timber, it the 39 tooth that got damaged left FOD in there, it may not be able to mesh with the drive gear. Maybe the drive gear has remnants of your 39 tooth gear OR maybe the drive gear itself go damaged.

The only reason that the speedo should read nothing at all is if the sensor is bad OR the gear isn't meshing and being driven by the drive gear AT ALL.

There are other things that could happen, but not likely in this case as you tried to replace the gear and now are getting this.
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Old 02-11-2009, 02:24 PM   #30
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I'd pull the speedometer gear and make sure it looks ok and reinstall it, ROTATING THE SPEEDO HOUSING more than you have so far to insure it is properly meshed with the pinion gear inside. I still believe that's your problem. This would not trip any codes that would disable the speedometer. The speedometer gear's external housing electrical connection is solid and plugged in properly, right?
Jerry,
I have done everything you listed including checking the plus connections. I even went as far as to clean the plug connections with electrical cleaner.

Quote:
stevens243
The only reason that the speedo should read nothing at all is if the sensor is bad OR the gear isn't meshing and being driven by the drive gear AT ALL
Stevens,

I think I may have damaged the sensor when the 39 tooth was installed.. That is the only thing I can think of.. I checked internally and couldn't find any damage to the gear within the transfer case extension. Also, since I have installed my original gear and driven it around the block several times with no apparent damage, it leads me to the sensor. I just ordered a whole sensor for $40 on eBay.. If that doesn't work, I will have to take it to a dealer..

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