69 dart with 7 1/4 going to the 8 3/4.I have read that if I install an 8 3/4 I will have to chandge my drive shaft.says axel centerline to yoke centerline is greater. on the 8 3/4 than the 7 1/4 I know I need dirrerent shock plates and thought my drive shaft would have to shortened thats it.Any thouights.
