AOD governor question
Freshened up my AOD, had to install a rebuilt
valve body, added a Baumann shift kit.
Had to be gone from home, so some of the
work was done by a local shop. He said he
found a sticky governor.
I now have very low up and downshifts.
I suspect he may have installed a low rpm
governor to replace the hi rpm Mustang
How do the governor's function?
What makes them signal the trans to shift?
the AOD governor rotates on the output shaft
The gov has weights in it. As the weights move out when the output shaft rotates it changes the gov pressure to v-body. As the gov pressure raises with an increase in road speed, the 1-2 shift valve moves for the shift to 2nd.
then 2-3 shift and the 3-4 shift
At the Bonneville Salt Flats, first gear is known as 130 mph.
According to this schematic
the "weight" you're referring to is probly
what they call the valve. That's about
the only moving part in there. I see there's
a spring inboard of the valve, so there must
be hydraulic (tv?) pressure on the outboard
end of the valve pushing it in. When the
rotation occurs, increased centrifugal force
apparently pushes the valve, with the help
of the spring maybe, outward to increase
the pressure which apparently must cause
the shift to happen. As pressure increases
from increased rpm on the output shaft,
it must active or open a series of valves,
keeping the first valves (for 1-2, 2-3 etc)
open until the rpm of the shaft (therefore
mph) decreases and the spring pressure
against those valves closes them to
effect the downshift. Make sense?
I think I'm starting to see how this whole
thing works. Now maybe I can get it
to work how I want it to work!
Thanks for the "seed"!
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