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toroutlaw 12-20-2005, 02:20 AM Hi everyone its my first post here Have an 02 3500 Duramax that will not go in any gear. I can move the gear selector but the transmission doesnt respond. Any suggestions?? Thanks in advance David Mackin 12-20-2005, 05:59 AM Transfercase in neutral? Or possible NSBU (gear shift indicator located on the driver side of the Allison). The NSBU is available at any Allison service department the dealer part ,same thing,is pricey. precision37 12-20-2005, 06:49 AM Has it sat for a while? if so, do a search on Allison drain back valve. toroutlaw 12-20-2005, 10:15 AM its been sitting for 3 days i washed it and then took it outside to a freezing temperature, does that change anything? precision37 12-20-2005, 11:53 AM Do a search on NSBU. Brinker007 12-20-2005, 02:52 PM Sounds like a NSBU switch. Part # 29540479 at your local dealer. Retail is $175.11 Dealer cost is $87.61 You can also call your local allison dealer if you have one nearby. They are around $50 from them. toroutlaw 12-20-2005, 05:04 PM Any idea how long to it takes to change it? Is there any pictures/steps on this site that i am not aware of? Thanks modified 12-20-2005, 09:12 PM They say it's covered under some warrantee. I don't know which. If you do it yourself: You can order the new tan NSBU from an Allison Dealer or dmaxalliTech from link below. It don’t get no easier than this: http://www.gmdieseltech.com/store2/cart.php?target=product&action=view&produc t_id=16197&category_id=278 Also, see installation info, (from this site), from links below. Anyone should be able to do it themselves. http://dieselplace.com/forum/forum_p...10021&PN=1 http://dieselplace.com/forum/forum_p...=9517&PN=1 And buy a spare. You may need it someday. I believe the Dealers get over $100. | ||