dont know about a 552nd but on my ad when i was doin the rear kit i had to beat the bottom rails up to bring em into square.as far as my front suspension goes when we put a tape on it,it was about an 1/8 off from one side to the other.it was already welded so i figured close enough...........dave


1949 Chevrolet 3100

"When this thing hits 88 miles an hour, you're going to see some serious sh%t." -Doc Brown