driveshaft ID please

# is a 2883778 8 L 9 above #

I needed a shorter shaft for my `67 Dart GT since I just replaced the 7 1/4 with 8 3/4 , and I found this one in my collection that fit perfect (happy days) and just wanted to know what it came from. It is 3 1/4 diameter.

My combo is a 340 engine 904 trans 8 3/4 rear

It's from a '70-'71 A-Body. The factory parts book shows it as 3" diameter 52.27" long with a 7260 u-joint.

Everything matches except this one is 3.25 diameter and it really not important it fits and now I know what it is off now.

Thank you very much John