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using different gear oils
My Ranger 4.0 5 speed recommends Dexron 2 ATF.
I had the oil "upgraded" to synthetic Mercon V - the supposed replacement for Dexron 2 which is no longer manufactured.
Shifting became PAINFULL. I lived with it for several years then switched back to conventional "universal" ATF. Over a period of several weeks the shifting improved markedly. It's now a pleasure to drive again. Absolutely no difference in fuel economy.
This is the Mazda built M50D
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