changing gear ratios iin 8.25

Can be done with proper tools. Believe you need an inch pound flex torque wrench, but I think rest are basic hand tools.

I'm sure you know, but just in case, a 2.45 rear will require a different carrier for other ratios. Also, watch for later truck rear end stuff as the spline count is different on the axles. I don't remember what they are off the top, but I think early is 27 spline and late is 29 or something like that.

Cheers