Automatic Transmission Trouble

Have just bought 1980: 240D. Transmission does not change out of lst gear. Any recommendations prior to removal and rebuilt.

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Make sure the vacuum going to the trans is 110% correct!!!!!
All the upshifts are vacuum controlled on the 1980 trans.

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Yes, first check that the "kick down" switch (under the accelerator pedal) isn't stuck AND that its wires (underneath the floor pan) are not abraded and shorted to ground.
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