Ron Yocum

ok, upon doing some research, I am learning that there are 2 options to replace the rear driveshaft pinion yoke on my 02 trailblazer. both are 10 bolts on the pumpkin, and are very similar. I tryd doing research on the vin and came up with nothing. Is there a way to tell what I have WITHOUT opening the rear end up? I need to replace the driveshaft and yoke but theirs 2 different size u-joints, and the splines are different also, so I don't want to order the incorrect yoke....thanks for any help in advance.