[TR] OD lubrication

[Randall]

> I stand by my original description.  When the OD state 
> changes, a solid axle car will experience an inpulsive 
> loading of one rear wheel and a similar unloading of the 
> other, caused by the driveshaft torquing the diff and axle 
> tube.

That's true, but with a 100hp motor in a 2000 lb car, it's not enough to
notice.

>  In an IRS car, this does not happen

But the frame and body get torqued, which in turn lifts the wheel anyway.

> In either case, something must absorb 
> the displacement difference between opposite sides of the OD, 
> and a short time over which it occurs corresponds to higher 
> stresses on whichever component must absorb them.

True.  But those stresses are relatively small and controlled by design,
compared to (for example) dumping the clutch in 1st gear.

Randall