I did that to an old sube..a 1987. same thing. fluid listed was bizarre thick. Tried synthetic against advice for the year (1987 didn't know what synthetic is) and as complicated as a synchrod, differential mounted dual range one piece tranny is...the synthetic really came through after a few months..dramatically. The key to winning is the wait...
I am going to seek that gm stuff...great test and thanks.
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