You don't accually have to mod the shafts to fit the diffs. You have to mod
the diffs to fit the shafts. The 1/8 diffs have the cups made on the shafts.
The emaxx diffs have the shaft the the drive shafts fit on.
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are the 3.3 diffs different from stock emaxx diffs will they fit in the combo bulks. Will they hold up to brushless or will they die on me i thought if they hold up to the 3.3 maxx they might hold up on a 50mph bl e-maxx is this true or will they break