LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

What is hypoy c gear oil?

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Old Jul 25, 2003 | 11:25 AM
  #1  
$hawn's Avatar
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From: Wichita, Kansas
What is hypoy c gear oil?

I'v been looking for a 75-90 gear oil that isnt synthetic, and found some castrol GL-5 75-90, but on the bottle it says hypoy C. so whats the difference, and can we run it in our differentials?
Old Jul 25, 2003 | 11:37 AM
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LWillmann's Avatar
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From: Middle Tennessee
That's what I ran in my diff before the 3.42 swap... Now running Redline synthetic.
Old Jul 25, 2003 | 11:49 AM
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From: Crossville, TN
I used that oil with the GM additive. 1200 miles and no problems.
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