2 pinion. I put the 3.35 back in it and sold the car. It's still cruising around without a problem. You may see it sometime. It's a 69 400 car with a 'Black Rose' paint job, black standard interior. It has the YH 428, 400 turbo and the 2 pinion posi. Best 1/4 mile time at Mid Michigan Motorplex was 12.57 with street tires. I ran that one in the street legal class. TONS of fun womping the 'stangs and Cutlasses. Won a big trophy.