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Originally Posted by Dackelone
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Well, that absolutely did the trick! The Redline ATF is like magic. It almost shifts like a new gearbox again. It’s one of two things: either the other oils I tried were too thick and bogged down the gears causing the synchros to work overtime, or they were too slick and didn’t allow the synchros to engage properly. Unfortunately GM Synchromesh does not list a weight and Motylgear is only an approximation. I believe viscosity was the main culprit. If this didn’t fix it, I was about to throw some limited slip additive in there and give it a go.
I would imagine I will see slightly more gear wear, but no big deal. Synchros will fail long before gears. This probably gives me another 50k miles before a rebuild.