I missed the original post with the problem, but here's what I know about
the Sure Grip:
The Sure Grip unit is not biased towards either side... the truck will tend
to favor the right side when on flat, level ground and each tire has equal
traction, as the torque from the driveshaft attempts to lift the right tire
and plant the left tire.
The way the modern Sure Grips work is that they have a cone which is the
friction material... There is a constant pressure on the cone which attempts
to keep the wheels spinning at the same speed... It IS possible to overcome
the friction of those cones and get one wheel to spin... the hardest test to
get this to work is to put one wheel on ice, the other on dry pavement (or
jack one wheel off the ground, but that's kinda dangerous) then punch it...
if you can overcome the friction, the tire on ice will spin, and you will
just barely crawl forward with the torque that has been transferred to the
dry pavement side. If you have the same truck under the same conditions,
but just ease into the throttle, you should be able to move before you
overcome the friction of the cone.
I like the pre-'69 posi, it used clutch discs, and the pressure applied to
the discs was directly related to the input torque on the yoke... so you
punch it, it tries harder to keep the tires in sync... but this kind of posi
really sucks in low-traction situations (snow, ice, etc) as I found out in
my '68 Charger the ONLY time I took it out in the winter... 8-0 not enough
torque on the yoke, so it just spins one wheel, until you punch it, which
does no good on ice.
Gary Shook
Penrose, CO
p.s. the above information is actually what I learned from pre-'75
vehicles... if anyone knows if the construction has changed... who's got a
FSM?
>It is a little over 8 months old. I have around 6500 miles on it. I just
thought it was weird that it only happens when I make left turns.
>
>Let me see if I under stand this "sure Grip" thingy... The right rear
wheel is the "power wheel" and the left rear only "locks" when the right
side slips. Correct? So if this is true, why would the left side "lock"
under this condition??
>
>Joe
>
>>>> <Jetmugg@aol.com> 09/13 3:17 PM >>>
>
>
>Sounds to me like an abnormality in your sure-grip unit (assuming that you
>have the sure-grip rear end). If the truck is brand new, it will probably
>wear in and be okay after 20K miles or so. If not, it sounds like there
>might be something strange going on in the rear end.
>
>SteveM.
>
>
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