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The 8 1/4-inch, like the 9 1/4-inch, uses C-clips to retain the axleshafts. To remove them, just push in the shafts slightly so they clear the recess in the gears, and slide the clips off. The axleshafts can now be pulled out of engagement with the differential side gears. However, to remove the old gears and install the Powertrax pieces, only the right shaft needs to be pulled out a few inches for clearance.