just go welded
but yea the guts will definatly fit into the diff.
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Now, this is really quite simple, ok? Understeer works like this; you drive down the road, turn the wheel, but the car goes straight on, crashes into a tree and you die. Oversteer works like this: you drive down the same bit of road, turn the wheel, but the back of the car comes round like this, and you go off the road, crash into a tree and you die. Now, oversteer is best, because you don't see the tree that kills you.