Get an 09(I think) or newer with the upgraded rear end the older ones have an open diff also a few older ones have a problem with a valve in the fuel tank causing a stalling issue. Overall we loved our 06 other than the fuel tank issue, we did get a letter in the mail after tradingitt in that...
Cal tracs would be a much better way to go especially with the lowering blocks. The blocks push the axle further away from the spring and causes worse axle wrap,probably why your bumpstops are so hammered now.
If you're hitting 210 with a 170 tstat going down the highway then you've got something not working like it should and a larger radiator would just be a band aid fix. Have you tried a water pump?
The factory cooling system is more than enough, a 170* thermostat is generally what we switch to to lower the temp, your ecm will need to be reprogrammed to kick the fans on at a lower temp or it will run about the same temp as stock in traffic but cooler on the highway.
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