I did mine last month at 83k miles. I replaced the tensioner, idler and water pump while I was in there.
-1999 Mustang GT-SOLD -1994 Exploder-SOLD
-2003 Sonic Blue SVT ZX3 -SOLD
-1998 Mark VIII LSC Collectors Edition #592 -SOLD
-2001 Mustang GT 5 Speed -2003 Explorer- Daily Driver
-2002 CD Silver SVT ZX3, Vortech Supercharged