My 2000 Silverado 4x4 Z71 Ext LT has had a few front end rattles
when the driver's door was slammed:
Had a loose drivers door window power regulator (FIXED)
Had loose self tapping bolts on the front Cross member skid plate
I now have a mild 'bump' rattle after the 4 Z71 shocks were
replaced at 75K miles
with stiffer Monroe Reflex units. (Not Fixed yet)
Its most likely the ISS, its a known issue. Use a cord/rope/chain/whatever
to hold the steering wheel from turning and unbolt the shaft at each end
and remove it. Squirt some grease in the shaft and use a rubber stopper to
plug the end (you can get them in the hardware stores) and compress the
shaft to squeeze the grease into splines of the shaft.
I think this spring I'm going to drill and tap mine for a grease fitting.
No, they put in the same shaft hoping it will last until your warranty runs
out or you trade it for another truck.
If you don't and complain loudly enough you sometimes get an updated shaft
that doesn't clunk as soon as the original.
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