If there is no tag on the diff cover anymore then I would do the following.
Jack up the rear end, transmission in neutral, rotate the tire one rotation and count how many times the driveshaft rotates.
The number of driveahaft rotations to one wheel rotation is your gear ratio.
Count the ring gear and pinion gear teeth. Divide to get gear ratio.
And the 8.8 will need you to reweld the perches to do it right. They aren't bolt in. Lots of threads on this topic. Should be able to find all the info ya need in a couple min. It's definitely a pretty easy swap. 95+ is the desireable years because of disk brakes
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