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I am doing a 51 and put in the same firewall. Could you please tell me what the length of your ford 9 inch is. I want to put on in my truck without doing any modifications to the bed or frame. I have 255 50 R 17 tires for the rear with 17 X 8 wheels and I think a 4.5 inch back space. Does anyone know the best way to measure to get the proper rearend width. Thanks