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A few months ago my truck was starting to consistently grind on first gear (and maybe another, don't recall now). I changed the oil, and it stopped grinding, so the oil made a difference for synchros. Now it's having a hard time going into fifth. It's not bad, but I picked up the parts the other day to replace the bushings around the stick, in case that's the prob, and I'd be open to putting in a better trans oil if there's something recommended....
There was a thread a while back where someone was claiming that we could run a particular synthetic motor oil in the diff and trans and see some significant mileage gains, as well as not harming the trans. Hmm...
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