7.25 to 8.25 Swap Questions

You will also need 3" u-bolts & shock plates, the 7 1/4" differentials have a smaller diameter tube.

Depending on the axle ratio, you may also need a transmission speedometer pinion with the correct tooth count for your speedometer to read correctly.

Driveshaft length may also be an issue.....

Your leaf springs will be fine if they are in good shape.

If not, great time to add an extra leaf on each side.