1951 GMC by admin | Mar 16, 2016 | News | 0 comments 1951 GMC in the shop to get a Cummins engine swap. After completion, truck will be for sale. Another interesting product at Mayhem Marine & Performance Automotive Division. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Submit a Comment Cancel replyYou must be logged in to post a comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.