Join Date: Dec 2009
denis is offline
Re: 2000 zr2 np 233 transfer case capacity
It takes 1.25 QUARTS. 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 2.3 quarts). Since the 233 drain plug is not at the 'very bottom' of the case, you may not be able to get 1.25 quarts back in after draining.
The 233 takes Dexron III. And DO NOT put in Dexron VI as I did, thinking I was doing the case a 'favor'. Apparently, the DEX VI is too thin (too low a viscosity).
Since GM no longer licenses DEX III, GM has stated not to use any aftermarket fluid 'recommended' as DEX III use. Actually GM has simply relabeled its own DEX III as "manual transmission and tranfer case fluid". I do not have the part number handy, but you should not need it at a dealer parts shop. I really wonder who is making the GM 'official' fluid, since obviously GM does not. This is a mineral base fluid, not a synthetic.
My dealer is pushing BG Synchro Shift II for the 233 transfer case. This fluid is full synthetic. It is rated as 75W-90 gear oil API GL-4, and also as meeting GM Synchromesh spec 9985648 P/N 12345349. Unfortunately it costs $20 a quart, and you will need two.
What other fluids are people using in the New Venture 233 transfer case?
Last edited by denis; 02-12-2010 at 04:06 AM.