thatK30guy: D60\'s What year did they start putting D60's in 1 ton GM's. I saw the following post and thought they started before this, but wasn't sure: "Mike-The D60's didn't come out untill 77. There is a D44 in the front of my 76 1ton." I could be wrong but didn't the D60 come out before 77? If you didn't built it yourself, how can you call it yours.......?