8.25 vs. 8.75?

What gears are in the 8 1/4 and is it an automatic if it's an auto and you don't go pounding the crap out of it it'll probably last. Also which 8 3/4 is it, 741,742 or 489. Look for the casting number on the bottom of the nose (just below the yoke) last 3 digits. If you do switch to the 8 3/4 you'll have to have the drive shaft shortened.