The tensioners each came in a box with the part number on them. 1 had an L for the left and 1 had an R for the right. The tensioner in the box marked L had an R on the tensioner itself. The box marked R had a tensioner marked L on it. Was this just a screw up and the wrong tensioners were put in the wrong boxes or has anybody encountered this problem either? I watched a youtube video were a guy took off his tensioners and he noticed that the tensioner from the right side was marked L and the tensioner from the left side was marked R so technically they were on his truck backwards. Is this a 5.4 issue or does it even matter? Because from what I can see, There is no difference in either tensioner. I compared them very closely and from what I can see they are exactly the same. Has anybody ran into this problem yet? Thanks again

 

Install as marked on tensioners.