I was looking at the book page you mentioned. For the 70 Challys, it says 340, 383s are 45.60". for all transmissions. Next line it says 440/426 with automatics are 43.60". The driveshaft part number given for each shaft is the same. What gives? I need to get a driveshaft for my 70 with a 440/727/8.75....but before I can get it made I need a GOOD measurement. Which is correct??