7 1/4 Gear questions (crate 360)

Mis matched wheels are the LEAST of your concern when you finally destroy that rear and loose a tire and axle combo at high speed. Your considered lucky that didn't get destroyed yet.

8-1/4 at a min. 8-3/4 perfurred. You can get strange, Yukon etc... axles for it as well with redrilled bolt pattern to match the fronts.