As far as I know a 6060 and a Magnum are the same trans. (as in, I thought all Magnum's were 6060's and not T56's).
Now a 6060/Magnum over a T56? There are many internal upgrades the most important of which that pertains to you is stronger gear sets.
I've found it's easy to strip the teeth off of the input shaft and countershaft of the old T56 with over 800ft/lbs of torque.
RPM is an excellent choice for the 6060. They built the one in my twin turbo 07 Z06 and it always worked perfectly.
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