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Originally this '71 had a Turbo 350 transmission in it. The stock crossmember for the Turbo 350 tranny doesn't match the mounting distance of the new setup with the Gearstar 4L60; it's off roughly 1-inch. In order to mount the new tranny in the truck we needed to pick up a 4L60 tranny crossmember, which we got from CPP as well. We'll use this vacant hole (see arrow) as our rear mount for the new tranny crossmember, which should give us the inch we need.