I'm doing my 100,000 miles fluid change. My truck is a 2006 Chevrolet Silverado Z71, it has the Auto 4WD feature with the pushbutton controls. My Transfer Case is a New Process Gear 246. You can locate the tag on the rear of the case to determine what you have.
GM is the sole source for lubricants on these transfer cases, you will need to go to your local dealer for the lubes. I went to my dealership and provided them with the VIN from my truck and they gave me 2 quarts of the special oil. Well they didn't give it to me but it was relatively inexpensive.
GM Auto-Trak II Transfer Case Fluid.
Get access to the transfer case and find the drain plug. In some cases you may have to remove the Transfer Case skid plate. Mine had plenty of room and I didn't have to remove it.
Use an 18mm combination wrench or socket and remove the drain plug. Have a drain pan handy to catch the oil. Remove the Fill plug and clean both plugs up. These plugs are Aluminum so clean them good and apply a little pipe sealant to the threads. After the oil has drained out completely install the Drain plug and tighten to 18 ft.lbs. Use a pump like this, purchased from any parts store, this one cost me $10 at O'Reilly's.
Use the pump and pump oil into the case until it is level with the fill plug hole. It will take almost the entire 2 quarts. Install the fill plug, tighten to 18 ft. lbs. and clean up. Not much to it.
GM is the sole source for lubricants on these transfer cases, you will need to go to your local dealer for the lubes. I went to my dealership and provided them with the VIN from my truck and they gave me 2 quarts of the special oil. Well they didn't give it to me but it was relatively inexpensive.
GM Auto-Trak II Transfer Case Fluid.
Get access to the transfer case and find the drain plug. In some cases you may have to remove the Transfer Case skid plate. Mine had plenty of room and I didn't have to remove it.
Use an 18mm combination wrench or socket and remove the drain plug. Have a drain pan handy to catch the oil. Remove the Fill plug and clean both plugs up. These plugs are Aluminum so clean them good and apply a little pipe sealant to the threads. After the oil has drained out completely install the Drain plug and tighten to 18 ft.lbs. Use a pump like this, purchased from any parts store, this one cost me $10 at O'Reilly's.
Use the pump and pump oil into the case until it is level with the fill plug hole. It will take almost the entire 2 quarts. Install the fill plug, tighten to 18 ft. lbs. and clean up. Not much to it.
Comes out like a fire hose.
