driveshaft questions

[Mr.Supersonic]

hi everyone. in the planning stages for a 700r4 swap in my 68 c10. I have the 2 piece drive shaft, and its 2inches in diameter. there is a lady selling 2 one piece drive shafts out of late model silverado's. one is aluminum one is steel, both are a larger diameter but I'm not sure how big. I was wondering if I should convert to one piece shaft, or cut one down and use it as my front shaft and have it where the front shaft is larger than the back shaft. any advice? thanks all!