Hello, I have a 2001 GMC C7500 with a 3126 Cat engine, 35,888 miles on odometer. This truck is a digger derrick, and it has 13,813 HOURS on it also. Truck VIN number; IGDM7HIC2YJ512610. Engine serial number; 08YL89619. This truck came in with a mis-fire and th... Login to read more.