Hi Terry
So you now have about 40k mi on your Ranchos? The test of any shock's
effectiveness is of course dampening; how quickly does it stop the truck from
boing-boing up and down after a dip or similar road surface irregularity. If
the vehicle straightens itself out after one rebound you don't need to
replace your Ranchos yet.
In my experience the rear shocks on vehicles like trucks where you have
semi eliptical leaf springs on a solid axle tend to have a longer effective
life than on the front of the same vehicle when front independent suspension
is present. If you decide you must replace your Ranchos now, then before
ordering all 4, unfasten one rear shock from its bottom mount, and by hand,
force the shock up to near its fully retracted position then pull it
vigorously down to its fully extended position. If you feel you had to work
pretty hard in both these motions, especially the going up to collapse it,
then you are getting almost as much shock action as a new one is going to
give you.
Paul Sahlin
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