Yes it is! Not sure if you want to our not, but it is possible.
I had mine repaired due to wear of the guides back in 2007 and BD replaced everything with S&S except the boxes. 20K later still going strong with no issues.
That said, there is days I wonder if they keep going that way or not, but so far no problem
Hell I thinik Raywood is still going on his original TP Boxes and should be over 90K by now!