Re: Turbo 400 shifting adjustments
Yearly(?) maintenance would be to change fluid and filter, Owner's Manual suggested 2yrs/24K miles.
You might even after changing pan fluid, disconnect the upper oil line and run an adapter to hose to drain pan and let the trans pump out the oil from the torque convertor. See bubbles, stop, refill pan with 4 qts and do again. Keep doing this until oil is clean from hose. Reattach cooling line, add fluid, start up and run through the gears, and check level again. If you get a pint or more above full mark, don't sweat it.
The reason I said from the top tank fitting is because GM fills the cooler from the bottom. You case may be different.
Adjusting anything would be non-existent, I believe. Trans may have a shift kit in it. Light throttle is smooth shift, half throttle is a crisper shift, and WOT shift are sharp for OE set-up.
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