4L80E Shifting Soft and Slow (tune attached)

[LastCall]

You enable adaptive shifts by setting the shift times tables D1108,9,10 to non-zero... as an experiment, try setting these to 0.2s (yes even with your shift kit installed).

I set the shift times to .10 for the 1-2 shift and went for a ride... No change.

It doesn't seem like the transmission is slipping, just slow shifting. When it does shift, it is firm.

Could it be the shift solenoid? Any other ideas??

[Chevy366]

Depending on the size of the holes you drilled in the trans plate the TransGo kit should give you hard fast shifts for sure .
I did the middle sized holes and the trans shifted very hard and fast with stock trans parameters , there was no need to adjust from the stock settings .
All three holes were enlarged as pointed out in the kit instructions .
Let me put it this way , 1-2 shift would put down marks and felt like someone hit the rear bumper with a car .

[joecar]

You can try several things:
- set the Throttle Kickdown tables to all 100% in all cells (otherwise they can interefere with PT and WOT shifting);
- swap the two shift solenoids with each other.

+1 what Chevy366 said above.

[LastCall]

You can try several things:
- set the Throttle Kickdown tables to all 100% in all cells (otherwise they can interefere with PT and WOT shifting);
- swap the two shift solenoids with each other.

+1 what Chevy366 said above.

I will try both and report back... I am hope it is not the trans.

[slow67]

If they are GM/Delco solenoids, you won't be able to switch them.

[LastCall]

If they are GM/Delco solenoids, you won't be able to switch them.

I think they are the original ones that came with the trans, so I am assuming they are factory solenoids. I guess I should buy one and go from there.

[joecar]

Oh, I forgot that they may be different.

[slow67]

Oh, I forgot that they may be different.

Yeah some aftermarket solenoids are interchangeable, others aren't.

[Janke]

Im watching this thread because mine just recently started doing the exact same thing... shifting like mush. And you got the exact same setup I do.