Question about 1999 GMC Sierra
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Posted on Jan 02, 2017
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
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
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
Tips for a great answer:
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Transfer Case Description and Operation for the Transfer Case - NVG 246-NP8
Transfer Case Description and Operation for the Transfer Case - NVG 261-NP2
Transfer Case Description and Operation for the Transfer Case - NVG 263-NP1
The SERVICE 4WD indicator is located in the instrument panel cluster (IPC), and shares the common power and ground of the IPC. The transfer case shift control module controls the service indicator by sending the IPC a Class 2 message. This indicator may be controlled with the scan tool using the IPC device controls.
You should take it to the dealer an have it checked for DTC'S -diagnostic trouble codes
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