We're not there but this really sounds like either the bowden cable is miss adjusted, a vac line is unhooked, or "vacuum module" (unsure of its true name) on the trans is damaged in some way. The valve body could also causing this but its very unlikely.

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Current:
'74 450SLC
'89 190E
'95 E420

Previous:
'94 E320
'87 300E
'73 350SL
'75 450SL
'95 C36
'99 C43 55 swap