hi,the local rally and competition place by me "been going about 25yrs" always used to say to me when i was doing a pinto bottom end replace with a new genuine ford pump on a good spec engine instead of a higher pressure item.they used em in there own cars and never gave a problem so i did same and will do this time when i finally get around taking my car off the road,i think a 4x4 pump is bigger aswel i was told mine has one but cant say for deffo yet.