I installed the TCI unit in my 55 2nd series.It has worked out very good for 5 years.The main thing is to read the instructions,measure,and measure again to make sure everything is lined up and square,before you strike that first arc.I had to make one phone call to cust.service concerning the power steering pump,and found them to be very helpful.The truck runs just great,and with the built 350 and 700R4 OD trans.,it is nice running down the freeway in the centerlane passing everything in sight.