Join Date: May 2009
Location: Los Angeles
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According to my information the transfer case your 1999 Chevrolet K1500 truck has is the 246 t-case....my book only goes up to 98, but I would suppose it's correct. Maybe another member can chime in with the correct info. Did you look at the t-case tag or the owners manual, it should state which t-case the vehicle has. If it's the 243 as you state, it was optional on K trucks only from 96-98, it uses approximately 4.6 us pints of Dexron 3 fluid (GM P/N 12346143). The front axle uses 1.75 quarts (1.66 liters) of
SAE 80W-90 GL-5 gear oil (use 75W-90 gear oil to prevent hard shifting during cold weather)...this is using the 8.25" IFS front axle, which I am certain of. If it uses the 9.25" IFS it uses 2.2 quarts (2.1 liters) of the above mentioned fluid. As for the rear axle, I do not have that information, hopefully someone will chime in. Late.
I need a bigger engine!