1967-1991 Ford, Lincoln, Mercury C6 Automatic TransmissionsThe B&M Transpak is the next step up from the B&M Shift Improver kit. It has all the features in the Shift Improver kit, plus it provides additional driver manual control (GM TH 400, 350, Ford C 6 and Chrysler Torqueflite only). The B&M Transpak for 1967 1991 Ford, Lincoln, Mercury C6 automatic transmissions recalibrate's your C4 transmission for optimum performance to best suit your needs. Most stock automatic transmissions won't downshift into low
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