Roy ;
I like to set 'em up a little bit " light " to compensate for the
center wear :
Wheels off the ground , steering gearbox full to tippy top with 90W
gear oil then grease all the king pins and tie rod ends until the
front wheels easily move side to side with light hand pressure .
Ajust the worm gear pre-load to 2 # or so , use a fish scale
attached to the outer spoke of the steering wheel and pulled at a
90° angle (' Tangential Pull ') , then center the steering box and
adjust to barely zero play , if you're lucky it'll actually get
tighter feeling as you turn it off center but *not* be so stiff the
steering won't " unwind" by itself as you come around a right hand
corner , let go the steering wheel and punch the gas .
It's a trick getting the pre-load & slack adjustments to balance
with the worn spot on the center of the worm gear ~ if you read the
GM steering gearbox rebuild insteructions they tell you to set it up
tight in the dead center as it'll be looser as you turn off center ,
this is O.K. as 90 % of the wear occurs in the center position .
Removing the drag link is usualy easier than popping the pitman arm
off and allows you to ascertain *true* centerpoint , this is _VERY_
important as these were just slapped to-gether by bored assembly
line workers and are often a few splines off center... this screws
up the front end's geometry and makes the rig less pleasureable to
drive . if the pitman arm isn't pointing straight down when the box
is in true dead center , then you'll need to remove it and properly
position it a few splines .
As always , the Devil is in the details .
So to recap : preload on the _worm_ gear , NOT the sector
adjustment , that one gets adjusted best as can between less play
and too much drag .
I hope this helps ? .
-Nate
Roy wrote:
>
> I think I have seen some stuff on this before but can't find it.
The Shop manual says to disconnect pitman arm and adjust for 1 to
1.5 lbs tangential pull on the wheel to maintain motion near the
ends of ravel. Then it says to adjust lash adjuster for no play then
check for 2 to 2.5 max tangential pull through center. I thought I
saw something that essentially said adjust for 10 lb tangential pull
at center then adjust out all play with lash adjuster. That would be
easier than pulling the pitman arm loose. Am I crazy or did someone
provide the latter procedure? Does it sound reasonable?
>
> Roy
Ole Chevy and GMC trucks rule!
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