Ok so I'm new to this making a drive shaft I have 66 impala 4dr has a BBC 396 and 700r4 transmission with. 10 bolt. Yes the transmission was switched out from a power glide I believe. I need to know how long of a shaft do I need so I can order one. Thanks in advance. Picture is the same car. Need help my son went through Brain cancer and I want to get it done for him.