For 2007-2010 Ford Explorer Sport Trac Timing Set 34411dt 2008 2009. Melling timing chain kits provide an efficient and economical way to provide the timing components needed for a quality engine rebuild. Timing chain options include both standard and roller chains to provide matches with the high quality sprockets and if necessary tensioner and guides that fit the application. Melling chains and sprockets are manufactured using the highest designs, quality materials and workmanship. Melling chain kits offer you the coverage and choices of standard, HD and performance to fulfill your timing needs at every service level.