Hey revedup I have a 76 c-10 I am thinking about cutting the front suspension from for my 55 2nd series. I have found where one guy did this swap at www.webrodder.com/article.php. If you find any more info let me know I will probably start getting the 76 to the shop this weekend for the get down measuring to see how well the front ends will match up. Thanks for any info 552ndser