Broke #4 NV4500

With the talk about converting to a NV5600.........
Here's a thread where it went back and forth what held more power:

Anybody had this much trouble with NV4500? - Competition Diesel.Com - Bringing The BEST Together

I've never made 600hp on a truck before, so I don't have a valid opinion on the subject matter. But I was under the impression that NV4500s held quite a bit of power and the NV5600s were bullet proof after a input shaft. Just going by what has been said in the past. Makes me want a Auto.
 
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