[oldman]

well they are basically the same trans, and trans strength is basically determined by the distance between the main shaft and the counter shaft. That said, the trans is rated at 560 ft lbs and it is a torque thing. Depending on the supercharger this can be WAY overloaded, it is the repeated twisting of the shaft that causes micro-tear. Put it this way
in the old days we would scribe a new axle down its length and when it reached 1.5 twist (forget now) we would toss the axle. That is how much twist progression we are talking about. This causes micro-tears in the material that will cause a spiral failure point.


https://threepedals.com/blog/technic...trofit-tr6060/

AFAIK the T56 Magnum ahem TR6060 has thinner synchros that allow it to have more gear with (larger contact surface). Since the gears are more conventinal single gears, there is more room for a larger gear, vs a single piece cut into two gears (need room for cutter). The input shaft has more splines and a larger bearing.

Just found the article:

http://www.superchevy.com/how-to/tra...rque-capacity/