I stumbled across a random old post on tardworld and found someone else that had my issue. The heat shield on the driverside catalytic converter was loose and rubbing against the exhaust pipe. Kept getting worse and worse over time. It would start off rattling really loud on take off and the sound would die off around 2k RPM.
A couple of hose clamps later and problem solved! So nice to have a quiet truck again.
Hose clamp is on the right side.
A couple of hose clamps later and problem solved! So nice to have a quiet truck again.
Hose clamp is on the right side.
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