1964-1974 Tempest/Lemans/GTO Frame, Trans, Diff.
Just got my 67 convertible back from some restoration work. I continue to have a problem with the Dual Shift on the TH400. It goes into 1st gear ok, but then shifts automatically into 2nd. I always thought the idea was to be able to upshift when desired. It does stay in 2nd and shifts to 3rd...