Question about 1999 GMC Sierra

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FLUID NP8 TRANSFER CASE

FLUID TYPE

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If you talk to Royal Purple they will tell you that their synchromax oil is perfectly fine to replace the auto Trak 2 fluid I have used it for years never had a problem in fact I think it's a better fluid than the factory fluid

Posted on Sep 18, 2018

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Posted on Jan 02, 2017

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SOURCE: Ned to change the oil in transfer case

The Z71 typically comes with the auto 4wd transfer case (cannot remember the GM number). This requires AutoTrak II, which is available at a GM dealer. Do not use any other fluid in this transfer case! The previous post was correct in the location of the two plugs, but not on the fluid (the other types of transfer cases by GM use ATF). The transfer case is located under the truck right under the cab. There is a small skid plate under it, and a large driveshaft leaves the rear end of the case heading to the rear differential (axle). If you have the manual or electronic w/o auto 4WD transfer case, you can use Dexron III, but Dexron VI is a better fluid that is also now available at your local auto parts store. Again, if you have the AUTO 4WD button in the dash, use the AutoTrak II fluid from the dealer.

Posted on May 22, 2009

Molson02536
  • 3854 Answers

SOURCE: fluid type in 1985 gmc sierra k2500 4x4 aluminum

You can use the same ATF as the transmission or a synthetic ATF for GM Transmission. Most guys will use normal ATF and mix Lucas ATF transmission additive to it, to make the fluid last longer. Good luck and hope this helps. There was two types of transfer case available to your truck. NP205 takes 5.1 pints NP208 takes 10.0 pints

Posted on Jun 05, 2009

  • 62 Answers

SOURCE: what type of fluid goes in the transfer case on a

The correct fluid for your transfer is dextron/mercon transmission fluid.To check the fluid level,jack up both ends of the vehicle and be sure to support with jack stands.Make sure vehicle is level.If you look at the rear of the transfer case,you will see two plugs,one lower than the other.Remove the lower plug and if fluid runs out it was overfilled,if nothing runs out,stick your pinky finger in the hole and feel for the fluid level.If it needs fluid,remove upper plug and pour in fluid until it runs out the bottom hole.Then replace plugs and lower vehicle

Posted on Aug 07, 2009

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1 Answer

2005 Silverado 1500 crew cab stuck in 4wd high?


How many buttons on 4X4 switch ? Or doesn't have any . What transfer case does your have ?
Transfer Case - NVG 149-NP3
Transfer Case - NVG 246-NP8
Transfer Case - NVG 261-NP2
Transfer Case - NVG 263-NP1
4X4 light saying lit ? Flashes ?
The NVG 246 EAU transfer case features a 4 button shift control switch located on the instrument panel.
The NVG 263 transfer case features a three button shift control switch located on the instrument panel.
Need more info . Could have DTC'S - diagnostic troube codes
DTC B0790
DTC B2725
DTC C0300
DTC C0305
DTC C0306
DTC C0321
DTC C0327
DTC C0359
DTC C0374
DTC C0379
DTC C0550

Aug 26, 2017 | Cars & Trucks

1 Answer

99 gmc all the lights on 4 wheel drive control are lit up


GMC What ?
Which one of these does your vehicle have ?

Transfer Case - BW 4401 (Two Speed Manual)
Transfer Case - BW 4470 (Two Speed Manual)
Transfer Case - NVG 241-NP2 (Two Speed Manual)
Transfer Case - NVG 243-NP1 (Two Speed Selectable)
Transfer Case - NVG 246-NP8 (Two Speed Automatic)

Dec 14, 2016 | GMC Cars & Trucks

2 Answers

Where is the speed sensors located on a 2001 Tahoe


Vehicle Speed Sensor (VSS) - Allison
On the left side of the transmission
Automatic Transmission Electronic Component Views in Automatic Transmission - Allison
Automatic Transmission Inline Harness Connector End View in Automatic Transmission - Allison
Vehicle Speed Sensor (VSS) - 4L60-E
On the left side of the transmission
Automatic Transmission Electronic Component Views in Automatic Transmission - 4L60-E
Automatic Transmission Related Connector End Views in Automatic Transmission - 4L60-E
Vehicle Speed Sensor (VSS) - 4L80-E
On the left side of the transmission
Automatic Transmission Electronic Component Views in Automatic Transmission - 4L80-E
Automatic Transmission Related Connector End Views in Automatic Transmission - 4L80-E
Vehicle Speed Sensor (VSS) - Transfer Case
On the top left side of the transfer case
Transfer Case Control Component Views in Transfer Case - NVG 246 - NP8 (Two Speed Automatic)
Transfer Case Control Connector End Views in Transfer Case - NVG 246 - NP8 (Two Speed Automatic)
Vehicle Speed Sensor (VSS) Adapter (4WD Only) - 4.8L,5.3L,6.0L
On the left side of the transmission
Engine Controls Component Views in Engine Controls - 4.8L,5.3L,6.0L
Engine Controls Connector End Views in Engine Controls - 4.8L,5.3L,6.0L
Vehicle Speed Sensor (VSS) Adapter (4WD Only) - 8.1L
On the left side of the transmission

Mar 07, 2016 | Cars & Trucks

1 Answer

I have a ratteling /noise comming from my 05 trailblazer ext lt transfer case when hot


Chevy and GMC Transfer Case Problem - YouTube

? 2:32
www.youtube.com/watch?v=Nj5ZS8wOmNk
Jan 30, 2010 - Uploaded by beaud1ns i have a 2004 chevy silverdo with a np8 transfer case that went .... that little anti rattle clip on the case is removed and a new wide one that fit ...

Sep 09, 2015 | Cars & Trucks

1 Answer

On my 2000 gmc z71 is there any kind of vaccum lines on the front differential or transfer case to engage the 4wd and make the front tires move. i know for a fact that the transfer case is locking and the...


Do you know which of these your truck has ?
Transfer Case - BW 4401 (Two Speed Manual)
Transfer Case - BW 4470 (Two Speed Manual)
Transfer Case - NVG 241-NP2 (Two Speed Manual)
Transfer Case - NVG 243-NP1 (Two Speed Selectable)
Transfer Case - NVG 246-NP8 (Two Speed Automatic)

Dec 05, 2017 | GMC Cars & Trucks

1 Answer

My 2002 duramax wont shift into four wheel drive it says it signal that it does and both actruators seem to be working when i spin my front drive shaft the fronts turn and i here a clicking noise in the...


2002 duramax ?????? What make , model ???? Chevy - GMC which transfer case , how many buttons on the control switch or is it a dial ? These system's have electronic control modules , can set DTC'S -diagnostic trouble codes . Your best bet , take it to a qualified repair shop.
Transfer Case - NVG 149-NP (One Speed Automatic)
Transfer Case - NVG 236/246-NP8 (Two Speed Automatic)
Transfer Case - NVG 261-NP2 (Two Speed Manual)
Transfer Case - NVG 263-NP1 (Selectable)

Mar 02, 2018 | Cars & Trucks

3 Answers

2001 gmc sonoma 4 wheel drive slipping the lights on switch work goes into 4x4 but when you accelerate it slips out when you let off it goes back in any ideas?


Hello RD.
Yes, Inside your transfer case there is a clutch that is made up of several plates that are designed to slip when there is a difference in torque between the front and rear.
If improper type of fluid was put in or if the fluid levels were allowed to get low it may have caused damage.
If indeed that improper fluid was put in, drain and refill with the proper fluid.

NVG 136-NP4 (1-Speed Automatic) Auto-Trac II Fluid GM P/N 12378508
NVG 233-NP1 (2-Speed Selectable) Dexron III GM P/N 12346143
NVG 236/246-NP8 (2-Speed Automatic) Auto-Trac II Fluid GM P/N 12378508

Thank you for using FixYa.

KL

Dec 18, 2010 | GMC Sonoma Cars & Trucks

2 Answers

Im looking to find out what model transfer case is in my 2001 chevy silverado 2500hd with a 4l80e transmission. It is a 3 button automatic transfer case.


Here`s how you can find out.Go into your glove box and at the bottom you will see a white label about the size of a credit card.It will have a bunch of numbers and letters.Look for the N letter and then see if you have np,np1,np8,or np2.Np is a 149 1 speed automatic.The Np1 is a selectable.The Np8 is a 236/246 2 speed auto and the Np2 is the 261 2 speed manual.There is also tag on the back of the transfer case that will tell you what type it is.Hope this helps.Good luck.

Dec 01, 2010 | 2001 Chevrolet Silverado 2500HD

3 Answers

What kind of fluid do i need for my transfer case in my 03 silverdo 1500 5.3l 4l60e and how many quarts


It depends on what transfer case you have in your vehicle.There are 4 different types.The best way to tell is go into the glove box and on the bottom there is a small decal sticker about the size of a credit card it will have the info you need.Look for the NP codes i.e.NP8.NP1,NP2,NP3or NP8.I`ll give you the G.M.part numbers.NP1,NP2,and NP3, are the same 88861800.NP8 takes Auto-Trak 2 12378508.They take 2 quarts.Hope this helps.Good luck.

Apr 08, 2010 | 2003 Chevrolet Silverado 1500

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