I think I misunderstood. Will it shift into Drive at the shifter? If so, it will actually shift through gears, right? Just not all of them? Will it shift through the higher gears if you let off the pedal a bit? If it will, you may have to adjust the vac modulator (located on the transmission). Do you own a vac pump (as in a hand tool)?

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1989 300E 144K