Rear End & Gear I.D.
Driveshatft might need to be a bit shorter for a 8.75, that's the only thing this chart is good for...
An 8.25 can last a long time as long as you keep the fluid level up and check it occasionally. There are guys running low 11's with 8.25 rears.
Luckily, almost everything will go right across when going from 8.25 to 8.75 rears. The DS is the only significant thing you need to check