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Message: <blockquote data-quote="MrV" data-source="post: 23688" data-attributes="member: 12742"><p>So I have a 05 2500hd Duramax with the Allison trans and it has a 4wd issue. Sometimes the 4wd will work or at least I believe it is working, if I don't have the engine on and out the truck in neutral then hit 4h or 4l I can hear the solenoids/motors switching it and I believe the axle disconnect and the transfer case are working, I know the transfer case is working because just going 4h to 4l I can hear it and it seemed to be making noise from 2h to 4h but after driving it around or just switching between 4wd and 2wd a few times I get a service 4wd on the dash and either no lights on the 4x4 switch or the 2h light will be on but nothing happens if I hit the buttons. Curious if anyone knows where exactly is the best spot to start I have already replaced the switch and it does the same thing.</p></blockquote><p></p>