The addition of fat tires or an old, '60s-style heavy-duty differential swap often calls for a narrowed rearend housing and shortened axles. "So, what's so tough ...

The 9-inch Ford rearend has been the standard all-around bulletproof rear gear for years-in fact it's been the leader since its introduction in 1957. Back in the day, the big Olds rearends were found ...