Wild Bill wrote:

A service shop here would drill the converter housing to
drain it, then screw a tapping plug in it.
That type of service is worth paying for.

Until a) they drill through the friction material on the lockup clutch
or b) the stupid tapping plug flies out at 6500 RPM, makes a hole the
size of your fist in the bellhousing, and takes the front half of your
right foot with it.


It was great back when all American automatics had drain plugs, but the
truth is that if you let the transmission drain overnight when you
change your fluid you'll get all but about 1.5 quarts out of the
convertor. Since most automatics hold between 8-10 quarts, that means
you're getting 80-90% of the fluid. Combined with regular changes,
that's PLENTY of fluid exchange and no cause to go drilling holes and
screwing plugs in a precision-balanced piece of machinery.