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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
the 500 has a 10 spline input shaft just like the stock t5 and is made to hold about 500 ft/lbs and the 600 has a 26 spline input shaft and should hold 600 ft/lbs. hope this helps
Like the other guys have said the 600 can hold more torque and has a different input shaft. The gear ratios are different too. The 500 is geared very similar to theWC T-5 while the 600 has slightly taller overall gears.