Fun fact: The pumps were re designed by Pratt&Whitney in the 80s, 90s. Told in the book: Advanced Engine Development at Pratt and Whitney: The Inside Story of Eight Special Projects, 1946-1971
Interesting fact: The turbopumps were designed and manufactured by Pratt & Whitney. Rocketdyne's designs were always marginal and after the Challenger disaster Pratt was asked to redesign them. They were initially reluctant because they were in the running to build the shuttle motor but felt politics left them on the outside. It's in a very good book I have called "Advanced Engine Development at Pratt and Whitney: The Inside Story of Eight Special Projects, 1946-1971" with a bunch of other interesing stuff like a hydrogen powered turbojet for a spyplane and a high powered chemical laser.