Zr2 Transfer Case Fluid
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Zr2 transfer case fluid. New Process 231 which is a manual shift transfer case. Since the 233 drain plug is not at the very bottom of the case you may not be able to get 125 quarts back in after draining. Might be just enough clearance to do it.
There are two different transfer cases used in the blazers. The vacuum reservoir was so full of fluid that I threw it out and put in a new one. Additionally if the transfer case fluid level is low the entire transfer case should be inspected for leaks and damage.
If the shift cannot be completed the transfer case returns to the last chosen setting. See Driving and Operating in your Owners Manual. Drop in Transmission Fluid Level When the transfer case input shaft seal fails ATF moves from the transmission to the transfer case.
Makes the pan drop less messy. 852019 Transmission oil change with pan drop NOT bad at all. Then replace the plug adn clean up the mess.
In some places the genuine service manual from GM incorrectly states the amount required for the 236 transfer case which takes the new type fluid and 23 quarts. You will not have any trouble doing it. Cycle designated for these trucks.
The fluid in the transfer case serves as both lubricant and helps to keep the internal components cool and turning smoothly. I was told that the GMT 900 trucks have the Auto Trac built by Magna Powertrain. Transfer case fluid contaminate the vacuum system.
