Magnum Swap Transmission Options

Bobzilla said

Please clarify what you mean by "better." If you are going with a carb setup to keep things simple, then just stick with a 904 or 727 since it will be a simple bolt in deal. If you want an overdrive automatic you'll have to do some cutting and welding.

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There is the whole Gear Vendors route, if keeping it simple is important and want the benefits of OD.
This is the only option I know of that does not require modding much but the speedo cable and driveline.
25+ mpg hiway with a 5.9 Magnum is kind of nice, and worth doing if the person is up to it.