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Old 03-16-2017, 03:06 PM   #80
kehstr
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Join Date: Mar 2015
Location: Utah
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Re: 1972 Build thread.

Quote:
Originally Posted by hemi43 View Post
Yes ! I've had issues with both Auburn style (cones) and clutch style that come in our Blazers when using synthetics. I'm not a chemist, but I assume it has something to do with the friction modifiers much like the difference between Dextron and F type transmission fluid.

On my Blazer, I used Amsoil synthetic in the transfer case as well as the front Diff, but because the front is just an open diff, I had no issues.

What's odd, is that it claims right on the Amsoil tech sheet that their oil is compatible with locking differentials.
Yeah, my dad had the same problem in his blazer with a Detroit, and he used Schaeffer's synthetic. As soon as he took the synthetic stuff out and put regular 80w-90 in it, it worked perfectly.
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