8.25 Centre and Sure Grip issues

Old post I know.

I just ran into the exact same issue with the 8.25 in my Jeep Cherokee.

Same center section, 3.55 gears, same results.

It is correct that the carrier breaks are 2.45 and down, 2.56 and up.

The carrier we have will not accept the 3.55 gears.

The troubles with using a spacer to lift the ring gear to the correct location are that
1) I dont think anyone makes the spacer, though a GM8.2 spacer can be modified to fit
2) You will need to find 3/8-24 LH thread x1" or x1 1/8" hardened ring gear bolts, which no one seems to make, or use the stock length bolts and live with fewer engaged threads
3) When the ring gear sits atop the spacer, it sits high enough that it no longer is engaged by the machined "center" of the posi unit, which makes centering the gear exactly on the carrier near impossible.

Just thought I would share my $.02 from going through this. Good luck!

Ken G.