Hey guys, just half way through the t5 swap and decided to tackle the 2 piece driveshaft on my 66 c10. According to my calculations I will need to shorten the drive shaft 9 1/2"! This seems like alot to me becuase I thought I read another post from a while back and the guy said he shortened his only 3''. What I did was slide the s10 yoke all the way into the trans and measure from the center of the u joint on the yoke to the center of the u joint of the reared. I came up with 64 1/2'' centre to centre and subrtacted 1'' for play in the yoke. Is this the correct amount to subtract? Then I measure the complete stock 2 piece drive shaft and it measure 73'' from center to centre of the front and rear u joints. I did this with all the weight on the jack stands of the rear axle to load the suspension. Can anybody see anything wrong with the way I am doing this before I pay a driveline shop to shorten it? Thanks again.