Great info indeed.
But OK, I can be dense sometimes........ so bear with me.
This (link below) is what my trans shop recommended for my 4L80E. I did NOT use this. Instead I used a supply of Dexron-III that I had laying around.
http://www.wolfshead.com/specsheets/trans.pdf
Quote:
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This unique fluid is specially formulated to provide twice the service life of a DEXRONŽ-III (H) ATF and offers enhanced performance for both new and older transmissions. It is particularly recommended for use in new GM 6-speed automatic transmissions, and is fully backwards compatible with older GM automatic transmissions.
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So you are saying NOT to use this stuff (VI) in anything but a new 6-speed (ie: 6L80E)? I'm taken back at why he was highly recommending it (the "synthetic" VI stuff). He even told me to flush my other transmissions (mostly 4L60Es) and also replace then with this new fangled "synthetic" stuff.
Interestingly, the new fad is to indeed switch to using this "synthetic" Dexron-VI...everybody is praising it on other forums for how much longer it's "service life" is.
Basically, it's all hype then and should not be used in older transmissions? I want to get to the bottom of this debate. I'm all for not following the fads if I'm going to damage an older transmission...........