Is my LSD broke?

From: David Gersic (info@zaccaria-pinball.com)
Date: Mon Mar 30 2009 - 15:29:57 EDT


I got stuck in the snow yesterday. One problem was that the 4WD is dead, but
I'm pretty sure that that's an electrical issue. But the LSD isn't
electrical.

What we got, starting Saturday afternoon was rain, changing over to sleet and
freezing rain, changing over to snow overnight. By Sunday morning, what was
on the ground was about 1" of watery slush topped with 6-7" of snow. The air
temp was just below freezing, so the snow was the heavy wet stuff.

I backed out of the driveway ok and swung around to about a 45 degree angle.
Put the truck in 1st, and stuck there. If I gave it any gas, one wheel or the
other would spin, and the whole truck would slide sideways down the road
crown toward the curb, but no forward motion at all. I could even spin one
wheel by just putting it in 1st gear (manual trans) and letting in the
clutch.

With an LSD (confirmed both by the "Trac Loc" sticker on the rear axel, and
the "spin the wheels by hand" test, shouldn't I have been getting power to
the non-turning wheel, rather than just spinning the one that's slipping?

Is there a minimum torque that the spinning wheel has to have applied to get
the clutches to engage on the other (non-spinning) wheel?

This stuff was slippery enough that I could push the rear end of the truck
sideways by myself. I did this to get it closer to straight, shoveled out the
rear wheels, and got about 5' further down the street before sliding sideways
to the curb again. It took four attempts like this just to get moving forward
with any momentum.



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