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2004 Chevrolet 2500 HD transmission issue, need Help!! Truck will drive fine then sometimes with out warning will shift its self to neutral. When it does this if you step on gas, the speedometer will show the truck is going like 75, and of course there is little or no movement. I have replaced the ignition switch, and cluster, but no help. Trying to decide if it is a shift sensor, or a bad transfer case, or maybe something else???

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  • Cars & Trucks Master
  • 11,054 Answers

Did you have the vehicle checked for DTC'S - diagnostic trouble codes ? Testing is the key to finding the problem , not replacing parts . Your best bet take it to a qualified repair shop , unless you like wasting money buying parts you don't need . Do you know what a scan tool is ? not a code reader . One that can view scan data . Testing electrical circuits . Do you know what a wiring diagram is ? How to use it to locate testing points in a electrical circuit .
Snap On Modis Scanner Explained Automatic Transmission Part 1

Posted on Jul 06, 2017

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Posted on Jan 02, 2017

short shadey
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SOURCE: 2003 Dodge DSL 2500 transmission shifting problems

sounds like you should start by dropping the pan and changing the filter, put cheap fluid in it or reuse the old fluid if its not too bad bring it to a shop and have a transmission flush performed with a good flush machine your valve body is sticking and this should clear things up please rate -jeff

Posted on Sep 05, 2008

  • 180 Answers

SOURCE: Chevy Tahoe stuck in neutral

Transfer case

Posted on Jan 07, 2009

  • 10 Answers

SOURCE: transfer case making roaring rattling sound

it's possible you might need to just change the trans case fluid.... it's a pretty simple task, i usually do all the small minor work first before i take it to a dealer to fix.... if they said you need a new trans case, but didn't tell you why, more than likely there might be something you could do yourself to make it better... those service men have been working around vehicles long enough, they should be able to tell you exactly what's wrong!
i would also do a tranny fluid change to... some of the noise could be coming from there too -- when you change either fluid, add a little lucas transmission fluid stabilizer, it helps alot with seals and makes the fluid stick to the gears better...

Posted on Jan 15, 2009

  • 99 Answers

SOURCE: Chevrolet 2500 Not Running, May Be Fuel Filter Sensor

if it dont have good compression it will not start check the comp and make sure there no water in oil if fuel pressure is low it will not pop the injector open try some starting fluid

Posted on Jan 26, 2009

  • 1 Answer

SOURCE: 2004 GMC Sierra 1500 4wd. Auto transfer case light issue

I have the same problem. It is intermittent and sometimes shows up with service transmission message. To get rid of it just put the truck in park, press the 2 high button and shift into drive while it is still flashing. I will worry about it more when it blows up. You can drive with the vehicle showing the solid neutral and it seems to make no difference. It has to be a wake up problem between the control modules. It only happens on start up.

Posted on Sep 06, 2009

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sounds like you should start by dropping the pan and changing the filter, put cheap fluid in it or reuse the old fluid if its not too bad bring it to a shop and have a transmission flush performed with a good flush machine your valve body is sticking and this should clear things up please rate -jeff

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