Confused downshifts from 3rd to 1st/2nd

[thehemi]

Re: 1999 S10 4.3 (turbo) w/ 4L60E auto

I haven't done serious on-road tests to confirm, but I'm pretty
confident I know what my tranny is doing that is bothering me.

When cruising at lower speeds, maybe 30-35, I think cruising in
3rd gear. When I give it a bunch of gas, it needs to downshift.
I think what it's doing is going way down to 1st gear when it is
unnecessary, or when the need is very brief, and there ends up
being a lot of revving, shifting and occasionally maybe an abuse
mode being tripped? (Feels like the tranny disconnects briefly.)

What kind of things in the tune can I check out to try to ease
these downshifts so they're not so violent and unnecessary?

[S2H]

without a tune uploaded I cant say exactly...
but start by looking at any trans shift MPH/RPM/TPS tables

[thehemi]

Attached is the latest tune that I'm running.
Other than TM removed the rest are factory.
(Specific to the transmission tables, that is.)

[S2H]

yeah...looks like your shift tables could use some tweaking...

the 1->2 and the 2->1 tables should have a few more mph gap...
take the 2->1 table down a few mph

you can also zero out the mph upshift tables if you want it to shift by rpm only as you climb gears