Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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GM states that the only fluid you should use in the tranmission is T – IV. The transmission hold 8.2 quarts when doing a flush. See the filter location in the link below.
I would add 3 and recheck the level and top it off from there. If the fluid is black you should consider having the transmission flushed which will assure you remove 100% of the dirty fluid.