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Old 11-20-2001, 03:15 AM
Posts: n/a
Tranny won't shift without letting up

My 77 300d will not shift unless I drive to red line, then let off the gas. I fixed a leaky tee, which solved the engine run-on, but still have this shifting problem. Where do I start? Vacuum to the tranny? I've read many threads leasing me to assume a faulty modulator. This is a w123 chassis, 195k miles.
Craig N
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