Desired shift times...

[thunder550]

The stock parameters for a 3/4 ton Silverado with the 4L80E tranny are .4 down low and .3 up high (TPS I think....)

Is it safe to drop these to 0? Shifts feel a little sloppy right now, would like to firm them up but I don't want to break anything. Shift pressures are vacuum modulated so I don't have control over those.

[joecar]

Should be okay, it will just try to shift using the smallest time duration it mechanically shift at.

It won't firm the shifts up, it will make the shift transition occur quickly
(although it may feel firmer since reducing the transition time reduces ramp up/down slip).

Also set these times to zero when shift kit installed.