well looking like a rebuild not a 1600 vitesse . the problem is it may well have been set up for the diff, as my previous post no history with the car other than a hand written note book that looks years old stating 1500tc engine gearbox uprated diff have yet to find out what diff i have , can say very very fast off the line as a mini cooper driver found out on my first run on public roads sunday, he actually flashed me to pull over asking what the hell engine i had , stating could not be a 12/50 as badged. was peed off that a herald had out run him and going up hill. still not been out on a main drag yet so may well run out of steam at 50mph once i get my speedo sorted will know . paul