I bought my GMC in 1987. It was bone stock. I did all the work myself over the years. It's a 78 with a 4 bolt main 350, 350 turbo, np 203 transfer case, 373 gears with a Detroit Tru-trak differential. The motor is still stock and still runs great. 15 inch Cragers with 33 inch BF Goodrich Mud TA's.
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