Hey its hard to find stuff on the chevy nv4500 everything comes up dodge but just a stock transmission can handle how much power and torque?? Is it more reliable and tougher than the 4l80e??

 

literally the first two web search results. All your tech specs and vehicle applications are there, as well as reviews.
https://en.wikipedia.org/wiki/New_Ve...0_transmission
https://www.novak-adapt.com/knowledg...manual/nv4500/

 

thanks but I wasnt looking for specs i was looking to see how much power i can push through it amd what others have done

 

from the article ....
"The maximum GVW of the contraption is 14,500 pounds (6,600 kg), and the case material is cast iron."
This is a heavy duty transmission.
If you look at the vehicle applications, this transmission is put into 3/4 and 1 tons trucks.
So look up the engine output for a 2006 Chevy 3500 pickup with the biggest engine, and you will have your torque and power spec.