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  1. ⚙️ Transmission - Transfer Case - Driveline
    I have a 2017 Silverado Z71 that I have to replace the transfer case on. Can anyone shed some light on what all the numbers/ codes mean: AND 84109395 812928414 1230100000000X 31162466ANDX3510 These are all the numbers on the sticker that is “conveniently” on the top side of the transfer case...
  2. ⚙️ Transmission - Transfer Case - Driveline
    I took my 2013 Silverado 2500 for a short, slow & easy trail ride just to get the 4wd moving around a bit. However, while in 4low it made this whiney grinding type noise that got louder the faster I went (didn't go over 10 mph in 4low). Is this normal?? It doesn't do it in 4high or 2wd, only...
  3. ⚙️ Transmission - Transfer Case - Driveline
    hey all, been scouring the internet for help but thought I should come here with my specific problem. Truck is a 2007 Sierra 1500, 4.3, with manual shift transfer case (NP261). Recently purchased second hand as a bush truck at 300,000km The issue I am having is poor/inconsistent engagement of...
  4. ⚙️ Transmission - Transfer Case - Driveline
    So, I opened up my tcase, cleaned out the pickup and magnet, added a case saver, and did a general look-over. While the rear half was off I replaced the output seal. But I got myself confused, and I installed the output seal upside down...the drain hole is now pointing UP, not DOWN. Grr. How...
  5. ⚙️ Transmission - Transfer Case - Driveline
    I have now replaced the push button shifter, the encoder motor. Originally I got a 327 code and replaced the encoder motor. I could hear the encoder motor coming on, trying to engage and going back to neutral. The switch took a crap, so I replaced that. Tccm self test shows it to be good. Front...
  6. ⚙️ Transmission - Transfer Case - Driveline
    I've been looking for aftermarket options to replace the manual transfer case shifter knob for awhile now. Is it a certain size type/thread I should be looking for or are they all just universal & need some sort of an adapter?? Thanks in advance!
  7. ⚙️ Transmission - Transfer Case - Driveline
    Hello everyone, this is my first post and Iam happy this site is here to help us all out. I'm not sure if this is the correct place to post either but here we go. I've had a four wheel drive issue for the past few months on my 2011 silverodo 1500, it has the 5.3 v8 and is z71. I have trouble...
  8. ⚙️ Transmission - Transfer Case - Driveline
    My 2005 Silverado Z71 with the 264K miles has developed a loud squeal when travelling forward but not reverse. The truck has the M30 - 4-SPD AUTOMATIC TRANSMISSION with the NP8 - AUTOTRAC ACTIVE TRANSFER CASE. I have only had the truck about 2 1/2 years but the previous owner did seem to keep...
  9. ⚙️ Transmission - Transfer Case - Driveline
    This is on 2013 Chevy Silverado 5.3. So when I was driving the rpms started fluctuating and causing truck to shake some at all speeds it seemed. Got home started truck later and could hear a grinding noise while in park (kind of sounds like it's by transfer case). When truck first started it...
  10. ⚙️ Transmission - Transfer Case - Driveline
    Hi, I have a 2006 gmc sierra 1500 slt with the 5.3 V8. I have a service 4wd message on the dash. I already cleaned the grounds under drivers side. My 4wd switch seems to work and I can feel something shifting when I go into 4 low. It totally seems good until I go on a hill and just the rear...
  11. ⚙️ Transmission - Transfer Case - Driveline
    I have a 2011 Silverado 2500 and it has the manual four-wheel-drive shifter whenever I shift it into four-wheel-drive. The front driveshaft spins yet the wheels do not engage. Is this some sort of actuator that needs to be replaced? TIA for any help.
  12. ⚙️ Transmission - Transfer Case - Driveline
    I have an 03 GMC sierra quadrasteer that I am trying to figure out if it has the np3 or nr3 transfer case
  13. ⚙️ Transmission - Transfer Case - Driveline
    My 02 Chevy Silverado 1500 was having intermittent problems switching into 4hi. I did some research and tried a new 4x4 actuator, didn’t solve the problem. I noticed when I’d push 4hi my 4lo would flash or when I pushed auto sometimes my 4hi would flash. Took my 4x4 switch out and checked...
  14. ⚙️ Transmission - Transfer Case - Driveline
    Here’s what I got. When I drive, I hear a steady thump.. thump.. thump.. 1x every wheel rotation, coming from the left front wheel area. Sounds like a thump or really low grinding noise. The problem is especially noticeable at around 40 mph and in moderate left turns, for example in a...
  15. ⚙️ Transmission - Transfer Case - Driveline
    2011 Silverado 5.3l 6l80 3.42 z71 3 inch lift 275/55/20 Ever since I got the truck when I would try 4x4 it felt like it would jerk me back and forth but I chalked it up to using it in to dry of conditions. I just used it going up my gravel drive a few times to make sure it works bc it snows a...
  16. ⚙️ Transmission - Transfer Case - Driveline
    -40 this morning. Silverado with a floor lever for 4wd. Backed out and then wouldnt move forward or back in 2 wd or fwd high. Engine reved but nothing moved. After 5 minutes tried in fwd low and it pulled back in driveway. Will try again when we get a break in the weather. Any ideas -...
  17. ⚙️ Transmission - Transfer Case - Driveline
    Hello I have an 04 Silverado that the front axle isn’t engaging on I have tried replacing the actuator on the axle and replacing fuses in the engine bay and cab. I have put the truck on stands and put it in 4x4 to see if the front drive shaft is spinning and it is so it is not the transfer case...
  18. ⚙️ Transmission - Transfer Case - Driveline
    Hey guys, was wondering if there was a difference between the 8speed (NQH M5U) transfer case and the 6 speed (NQH MYC) transfer case? Aside from them having a different RPO. I looked around a bit before posting this and couldn’t find anything regarding this. Sorry if this is repetitive. The...
  19. ⚙️ Transmission - Transfer Case - Driveline
    Hey everyone, I have an 07 classic 2500hd Duramax. Over the last year, my 4wd would sometimes not engage. The light would blink next to the 4 high button but would never turn solid and would go back to 2 high. Usually the problem was remedied by driving for a mile or so and it would work after...
  20. 🛻 Uncategorized Truck Topics
    With my ‘12 Sierra about to roll 90k miles I decided to give it some love. I bought it new and it’s been a great truck. Zero repairs or problems along the way. Below is a list of what I did and any notes or observations. Hope this helps someone. Coolant flush/fill - this was definitely due...
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