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The tranny on my 85 olds (TH-200-4R overdrive transmission) shifts hard & sometime "thumps" going into 3rd gear. The tranny fluid is clean, not burnt & no whinning noise. Would it be ok to drive in D instead of OD esp on the freeway ? The tranny has 124+ miles on it. I could stay off the freeway & not exceed 50 mph if i have to.