The 8 1/4 thread

2. There were 2 carrier offsets, however. One for 2.45 and higher gears, and one for 2.76 and lower gears. In other words, you can install 3.55 gears in a housing that originally came with a 2.45 ratio, as long as you install the appropriate carrier.
From Dr Diff. You need the offset carrier for the 2.56 and up the regular 2.57 and down carrier (example post 3)