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post #1 of (permalink) Old 05-04-2010, 03:39 PM Thread Starter
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Location: kankakee county,il
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fluids

hey guys a quick question, looking to change the transfer case and the front and rear diff what kink of fluid and how much will i need?? thanks
its on a 99 chevy k1500 with a 243 transfer case.
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post #2 of (permalink) Old 05-04-2010, 10:47 PM
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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!
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post #3 of (permalink) Old 05-05-2010, 08:23 AM Thread Starter
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ok thanks ya i looked at the tag and it said 243, the truck says a 99 but its the 98 body style.
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post #4 of (permalink) Old 05-05-2010, 08:59 AM
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8.25 rear = 4.2pts

9.5 rear = 5.5pts

10.5 rear = 5.5pts


I preferred Mobil 1 in the diffs.


On the tcase, remove the fill plug first. You don't want to drain it all out first then find out you can't get the fill plug off.

drain plug - 35ftlbs
fill plug - 18ftlbs

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Last edited by Shorts; 05-05-2010 at 09:05 AM.
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