> Anyone change one of these. How do you get to it.

Get to it from the passenger side.

> My manual is less
> than clear about how to get to it to change? Do you have to get to it
> from the underside in order to see the bolts?

At the top of the transmission use a 10mm socket. If you use a
phillips screw driver you will remove the top pulse module.

> Is it ususally just the top (pulse) module that goes bad.?

Both goes bad. The spring loaded rod wears the lower part the the
unit. The pulse pickup and it's bottom housing is sold as one unit.

> Can it be
> removed/replaced without taking the gear driven module off the
> transmission?

As stated, the VSS is sold as one unit. U should remove both to
inspect and refurbish.