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so on my Colorado I want to do the rear h3 diff swap mainly for gearing and the stance, but my 355 is already almost at 300hp and I will be adding more power so my question is what is the hp rating for those diffs cause I cant find it anywhere and if its low can I build it to handle more power? Also is there a different diff that anyone suggestions?
 

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H3 used the 8.5 diff. I have one in my 2011 factory V8 truck. On a side note, the factory V8 trucks also used the 8.5 inch diff. If you are coming from an 8 inch diff, you may find your driveshaft to be too long. Factory V8 driveshafts are about an inch and a half shorter.
 
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