Not a happy result!

Try removing a quart(AND then follow the factory fluid level check)
[1. Check when fluid is "Warm" , 20 mins driving at least...NOT WOT!
2. Check on LEVEL ground
3. Move the shift selection lever through all the gears and then back to Park
Then check the ATF level.
4. DO NOT use Cloth or Paper to wipe off the dipstick.Leather only
(Lint or paper fluff can obstruct the tiny passages in the valve body!!!) ]

It may be time for the internals of the .4 to be inspected.
('Thing is, if you're "In There" why not replace everything?)

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'84 300SD sold
124.128