727 slipping

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Just readjusted the kickdown linkage. The lever still had another 1/2 inch to go before being fully back. Fixed that and the car shift MUUUUUCH better. No slipping nice and firm. Thank you to those that helped.
 
Good. Then you are one of very few that got to it before any damage was done. I would do a fluid and filter change to try to get that stop leak out.

That is of course unless you're still cowering behind the ignore feature.
 
How many quarts of the new ATF went in? Was the unit and convertor dry when you started it?
If it were me, aside from taking a couple pressure readings, I'd drain it, drain the convertor, and stick some Type F fluid in it. Flaring on the upshift is not a sign everything is toast. Especially when you just had a good unit, and then replaced the valve body. I'm leaning towards a fluid compatibility issue which would affect the way the valve body does it's job, and the way the friction parts interact.
 
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