Tranny wont shift out of 1st gear! - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 03-22-2009, 08:32 PM   eBay Motors  #1 (permalink)
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SOLVED :Tranny wont shift out of 1st gear!

OK, so I pick up a well used Dmax only 72K on the odometer but it will not shift out of first gear. The gear indicator light does not work along with the tach and speedo. The truck makes an alarming slaming noise when shifting into drive or reverse. The torque converter is locking up and it will drive the tires into smoke however it will not shift. I just purchased this truck from a tweaker in AZ and got a great deal however he had stripped a bunch of parts from it to sell. Any ideas on what to do or how I can check this? The fluid level is full, red and does not smell burnt?
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Old 03-22-2009, 08:35 PM   eBay Motors  #2 (permalink)
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Sounds like you have a tcm problem check all your fuses in the cab and in the engine compartment.
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Old 03-22-2009, 08:38 PM   eBay Motors  #3 (permalink)
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check the neutral safety switch
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Old 03-22-2009, 09:05 PM   eBay Motors  #4 (permalink)
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I checked all the fuses in the engine compartment and under the dash. No problems? Where is the neutral saftey switch located?
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Old 03-22-2009, 09:17 PM   eBay Motors  #5 (permalink)
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I checked all the fuses in the engine compartment and under the dash. No problems? Where is the neutral saftey switch located?
neutral saftey switch is on the driver side of the transmision..its like a 20 min job to do...really easy.
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Old 03-22-2009, 09:22 PM   eBay Motors  #6 (permalink)
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yeah it sounds like a bad NSBU switch. It's not that expensive either.
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Old 03-22-2009, 09:25 PM   eBay Motors  #7 (permalink)
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Sorry is NSBU the neutral saftey switch? Can I check it or do I need to replace it?
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Old 03-22-2009, 09:28 PM   eBay Motors  #8 (permalink)
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Sorry is NSBU the neutral saftey switch? Can I check it or do I need to replace it?
just replace it...its a common problem on our trucks and its not to pricy to do..like stated above..just go ahead and replace it.
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Old 03-22-2009, 10:32 PM   eBay Motors  #9 (permalink)
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nsbu switch, Put it in 4 low and see what it does.
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Old 03-25-2009, 02:32 PM   eBay Motors  #10 (permalink)
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Ok NSBU switch is replaced now truck wont start? It may not be related to this work as it did this last week as well. Last time it acted up I pulled the bat cables and let it set for 10min then hooked it up and it fired up? I realy need a code scaner because it spins over great and I primed the fuel but something will not let it start?
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Track Truck - 2004.5 2wd, LLY, EFI Live w/ IdahoRob tunes, S&B CAI, PPE Lift Pump, Spring Clamps, Slicks, SC IV, EGR & AC Delete, and on a diet.
Driver - 2000 Ford Excursion, DP Tunes, AFE stage 2, Oil "X" over, regulated return by ITP, ATS turbo, BTS Trans, Diesel Site Boots, ect.....
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