Product review (5 stars): This kit will make your dryer run quiet again!
This kit was exactly what I needed to restore our Kenmore dryer to as-new decibel levels.  The dryer was making a very disconcerting, louder-than-normal rumbling sound.  Although the dryer still worked fine, we had to close the door to the utility room because it was so loud.

A few tips:

Before installing the new rollers, clean the roller shafts with a low/non-residue solvent such as MEK (methyl ethyl ketone) or brake cleaner.  Do *not* lubricate the shafts before installing the rollers.  The roller bearing sleeves are self-lubricating, Oilite-type bearings.  Putting oil or grease on the shafts will attract lint over time and gum them up.

Clean any deposits out of the roller channels at the ends of the dryer drum.  Use an old screwdriver and/or a wire brush and solvent to clean off any obvious rubber deposits that have transferred from the old rollers to the dryer drum.  Also use solvent to clean where the belt goes around the drum.

Before reinstalling the drum, use a small brass wire brush and solvent to clean the motor shaft pulley.  If you have compressed air available, blow it dry.  The idea is to get *all* the components that the belt and rollers come in contact with completely clean and free of deposits.