aluminum Powerglide from GM was built
from 1962-1973. They were set up with
two low gear rations; the 4-6 cylinder
engines usually had the lighter, weaker
1.82 ratio stamped steel housing planetary.
The V-8's were equipped with the 1.76
ratio cast housing planetary, which was
much larger and stronger. Lucky for us
the GM engineers over-built these parts,
and the 1.76 is used in a lot of race
applications. Stanley, without disassembling
the trans you can usually identify the
planet by the length of the input shaft.
The 1.82 planet takes a 12 5/8" long input
shaft and the 1.76 planet takes a 12 7/8"
long input shaft. As long as it hasn't
been swapped it can tip you off. If not
you would have to disassemble the trans.
gyro effect that you're experiencing is
very common on a racing automatic, but
especially on a Powerglide. You see, what
is happening is in park and neutral the
direct drum spins free over driven planetary
gears, so when you whack the throttle
hard it spins up and sort of makes the
car lunge but really doesn't move the
car. The reason that we notice it more
here than in a stock engine setup is the
race engine revs so much quicker, so Greg,
usually this is a non-problem.