I'd like to share my experiences regarding the sliding door - on some of my
vans I use Delrin rollers, on some I use OEM metal rollers to compare.

- Delrin rollers are quieter but the kit came with 2 Delrin rollers for the
rear and the bottom tracks only.

- Cleaning and sanding smooth the tracks help a lot, I'd think the noise
came from the pitting corrosion on the rear and bottom tracks.

- Strange enough on the vans with OEM metal rollers, on some it's almost as
quiet as the one with Delrin rollers.

- I'd think a well balanced door is quieter than a unbalanced one - I think
weight distribution to rear, top and bottom tracks helps, it's a try, miss
and repeat job. I notice some door is easier to balance than other, may be
depending on how worn the track is.

- Yes I put FatMat noise deadener on the cover of the rear track too, it's
help a bit.

- I put FatMat noise deadener and pink fiberglass in cavity of the sliding
door. It helps to bring down the noise by cutting the resonance. I'd think
the hollow door acts as an empty drum and it amplifies the noise.

dan