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Old 04-06-2005, 08:17 PM
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How to clean a valve body?

I just installed a ford AOD transmssion in a '88 t-bird behind a 5.0, and it won't come out of first gear. It worked last fall when I pulled it off another car. It had 110,000 miles on the original fluid. The transmission sat sideways for a few days before I installed it. I'm thinking maybe something got disturbed and a valve is sticking or something? I have a spare burnt out transmission so I took out the valve body and governor, and I want to clean them up and swap them in to try and fix this problem. Should I take apart the valve body to clean it, or should I just leave it together and soak it in something? If I take the top off the valve body will springs and balls fly out and make it impossible to put back?

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Old 04-06-2005, 08:48 PM
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Did you check the throttle valve pressure? Go to the TCI trans website
for instructions. The gauge block they talk about is .396" to .400" thick.
You can cut a short chunk of 7/16" bolt and saw a narrow slot in in
lengthwise part way thru just wide enuf to fit over the cable when
you pull the grommet out of the housing at the throttle arm.
I just use a good quality 50 or 100 psi oil pressure gauge with a wide
sweep so you can get an accurate reading.

Is the return spring on the tv cable at the trans inside of the rubber
sleeve connected so it forces the tv cable back to "zero" when you
let off the throttle?

If you've adjusted the idle, you need to readjust the tv pressure.

Or your governor could be sticking, it's inside the tailshaft housing.

Or your valve body (most likely) is sticking.

The only things that have springs behind them are two tiny
valves near one end of the valve body. Set the valve body
on a bench with the thin plate up. Loosen the bolts on the
round plates and remove them slowly, you'll feel a little spring
pressure pushing the thin plate upwards. You'll see the little
balls after you remove the thin (separator) plate. They won't
fall out unless you tilt the valve body. But you need to make
sure you remember where they go.

send me your email, I can send you a scan of the factory
manual, the part about taking the valves out and cleaning
them. There's lots of little parts, but if you lay them out
in sequence and be very careful not to disturb them and then
put them back in the exact same way they came out, it's
not that big of a deal. Just takes awhile. The schematic
shows each little part and how it goes. After you get
the parts out, soak it good with carb spray and blow out
with comp air. If you have some small soft bristle brushes
that are round, you could go in the bores and do some
cleaning. You can use very fine crocus or emery cloth
and gently polish the valves. Just be sure to rinse
very thoroughly with carb spray and blow dry a couple
times to get all tiny particles out.

Also, AOD's have a couple valves that like to wear out.
See the Sonnax web site for better quality replacements.
They're the throttle valve, and the combination main
regulator and pressure boost valves.

When you reassemble, be sure to get new gaskets
and torque the bolts to specs with a good inch lb
torque wrench. 80 to 100 inch lbs.
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