What is the measurement of the 51 rear end compared to the 79? What are the differences in spring mount pad locations and e brake connections? Can you post a photo. The items above could help someone answer your question. I see you are in California. I suggest you call Tom at Foreign and Chevy Truck Salvage on 5th street in Santa Ana, CA. Tom really knows old and new Chevy truck rear ends and transmissions and could probably answer your question over the phone. Tom also does installation and conversion work, if you are nearby. He has done good work for me on a couple of AD trucks.
