Oh absolutly stock. We don't know too much about it except what it says in the manufacturer pamphlet. It is all al body with wrap around window in front slider doors on both sides and swing open on the back. It has the hydrovac brakes and 3sp auto w/ od. I'm not sure which one of the sixes it has but it is GMC. It has the eight lug wheels so I think it's a one ton. Straight axle front end and reg rear with 8x19.5 tires/wheels. We only have one of the original GMC hubcaps