Yep, an inch is usually good. It depends on the rear suspension you have and how well it controls the axle. I've found with the 4 link I have, the yoke movement in and out is relatively small as the rear axle goes through it's normal travel up and down. Less than 1/2". Also, 4 links allow very little axle wrap. Old leaf springs will allow more movement, both axle wrap, and up and down motion. New leaf springs will be better. Add a set of traction bars, and it's even less. If you have an inch, you'll be fine.
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