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Old June 9th, 2009, 10:24 PM   #1
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Default Speedo stopped working

So i was driving the other day and the speedo started bouncing and then just stopped. Also the millage stopped to. Is it the plastic gear that come out of the t-case that went bad or you think it could be something else. A couple people told me to check the gear first. Is that a good place to start?
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Old June 9th, 2009, 11:11 PM   #2
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What type of truck we looking at????
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Old June 9th, 2009, 11:15 PM   #3
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It would help to know what make and year of vehicle you're talking about.

If it is an older one that has a rotating speedometer cable running from the tranny or t-case to the speedometer head. that cable is usually the first suspect. Often, they will first start to unravel at a certain spot, causing bouncing of the speedo needle. When it eventually breaks, speedo needle movement stops.
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Old June 9th, 2009, 11:20 PM   #4
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ive also had it where the cable must have been weakend and snapped going into the gear
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Old June 10th, 2009, 08:37 AM   #5
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Sorry 1977 K-5 Blazer w/ 355, Sm465 and NP205. It worked fine last year and wheni put the engine back in it, it started bouncing real low. It would go from 0 to like 10 or 15mph then just stopped worling all together.
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Old June 10th, 2009, 05:46 PM   #6
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How hard is that to change? Do you just have to buy a new cable if its that.
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Old June 10th, 2009, 11:11 PM   #7
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yes, you basically just take a measurment for the lenght you need and give that to your local auto parts store, it simply screws into the transfer case and in the dash it just has a locking mechanism that you just pop to slide the cable out be sure not to kink it as it will fail prematurely or not work at all, very simple task
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Old June 13th, 2009, 08:14 AM   #8
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Thanks
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