I drove my '84 Westy last night with it's new Bilstein HD shocks all
around, I could not believe the difference.  The Sach shocks (OE I
believe) had 150K on them but there was no bouncing to the van so I
though they were still good.  They had a lot of resistance when I tried
to extend them but less resistance while compressing them.  They made
the van ride pretty rough when it was empty, kind of like a pickup
truck.  With the Bilstein HD, the ride is much much smoother, no more
rattling the crap out of everything inside when I hit some bumps.  I had
always blamed the Yokohama 356 tires for the rough ride.  Now It's like
driving a whole different vehicle, much more pleasant and quiet.

Pascal