The downshift to first in the "3" position is electrical. I forget how it was done but the fuel pump relays on those cars had the word kickdown and a rpm. It should disconnect the kickdown at a certain rpm.

I'll have to think about it some as you shouldn't have to get to that high in rpm to shift to second.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician