went to virginia from detroit to pick up a car,904 trans let loose in the truck when I got there. $1600 for a rebuild, no old parts in the salvage yards .forget it. back home in detroit,I am going to upgrade to a 727 trans, so I need to get everything ready for a quick swap next weekend.i have the 727 yoke, how much to shorten the driveshaft? 904 trans is in vehicle,727 is it's replacement.