Update: Decided it wasn’t serious so drove the truck pulling our boat across country. 2000 miles. Rattle got less intense driving straight, then intermittent, while still full on while turning left. Then it became less intense on left turns, then intermittent and now appears to have stopped. Bizarre and mysterious
93 GMC 2500 pickup
4WD Xtra cab.
New Optimizer 10/14
Rebuilt Central Plains Diesel IP 10/14