Tightening the 2>3 overlap in a 727

My linkage is all LOKAR...I have a 750 Holley Carb ( vacuum Seconday) on a Perf RPM manifold.

This car is a Daily Driver only, 383 with 3.91 gears.

The tranny was checked out recently ( 6 months ago) and tuned up by California Performance Transmission (Art Carr's shop). They told me all the internals look good. Kickdown function is good.

This tranny works just fine when the Dart is left in "DRIVE"...it shifts fine when driving sedately, and when I mash the throttle, the shifts move up the RPM range as they should...

The issue arises Only when I go to shift manually @ WOT at 5800 RPM (I have a shift light). That's when the 2-3 shift goes into Time-delay mode.

IOW, I move the lever from 2nd to 3rd, and the actual tranny shift takes between 1.5 to 3 seconds to occur.

BTW, the manual 1-2 shift at 5800 RPM is Dead-On...

I move the lever from 1st to 2nd, and the tranny shifts in like 1/4 second...almost instantaneously