LSDs and Posi-Trac

[Wayne Cox]

At 02:59 AM 8/27/2002 -0500, you wrote:
>"Couldn't you just do the old posi-check trick; pick up the front end, and
>rotate one wheel by hand.  If the other tire turns the same direction,
>it's LSD-equipped.

Yes, all my B13s exhibit this behavior (wheels turn same direction).  But I
haven't messed with enough other FWD cars to know if this is unusual.  I
have seen it in action on old RWD GM cars, and it does seem to be an
accurate (if half-assed) test for Posi.

>No, you can't do that on our cars.  But, this does work on "posi-traction"
>equipped cars?  I forget, is posi-traction a clutch pack style of LSD?

Yup, Posi was GM's (TM) for their clutch type LSDs.

>>"Do VLSDs even operate at such low speeds?"
>No, at least not on our cars...

Uuuhhh...  Maybe.  Turning manually with the wheels off the ground, you're
not generating anywhere near the torque difference, so it might.

    -Wayne    '91 NX2k - '93 NK2k - '92 SE-R (parts car?)