1998 Chevrolet K1500 5.7L, Z71, 4x4
If you have the manual transfer case (lever actuated), use DEXRON-III Automatic Transmission Fluid. If you have an automatic transfer case (push button actuated), you should use the fluid that GM recommends. Some owners' manuals may say to use Automatic Transfer Case Fluid (GM Part No. 12378396), which is a reddish colored fluid. GM has a new Auto Trak II Transfer Case Fluid (GM Part No. 12378508), which has a bluish color to it. The newer fluid has better friction modifiers. While your doing the job, it's a good idea to change the drain and fill plugs (GM Part No. 15032997) out too.
SOURCE: type and capacity of fluids
The kind of fluid needed is called GLS this is not something you can get at some grease and go. To my knowledge this particular fluid is still a dealer only item. DO NOT put ATF in your transfer case. I don't remember the capacity but the dealership would have this information.
SOURCE: 1995 chevrolet k1500 transfer case fluid fill hole
LOOK ON REAR COVER OF THE TRANSAXLE CASE.TOP PLUG IS FILL HOLE BOTTOM PLUG IS DRAIN PLUG.
SOURCE: I am trying to find
it uses DEXRON III but the updated replacement for that is DEXRON VI , so use the DEXRON VI
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