Well, My 89 pump has just a pin to hold afc lever. I had to remove to change the shutdown lever. No problem their. But the 91 that I was taking the part from has the balls and what not. AND I BROKE IT. I had it in the vice and was working on the ball removal and had a miss-hap. So long story short My truck reuns great, But the 91 wont until I get a pump top.