Ray Finkle

First off, I am using EFI Live to tune the truck for the time being. It is a 2003, ECSB with a 5.3, stock height tires also.

I completed my 4l80e swap the other day. It has a 3200 stall Circle D converter and a transgo HD2 shift kit, with a few mods that Jake suggested, rather than transgo. I have since been driving it around, tweaking the tune to my liking. The issue is, I set the 2-1 downshift to occur at or below 48mph. It performs the downshift properly, but as soon as rpm comes up to 4800 rpm, it up shifts to 2nd, pulls for about 1 second then kicks back down to 1st where it completes it's 6000rpm pull and then clicks 2nd gear normally.

I raised the kick down mph to 51mph to try and remedy this 2-1-2-1 fiasco. That only made it worse, now anything between 40mph and 60mph does the exact same thing.

So I lowered the kick down mph to 45mph and that has effectively solved the 2-1-2-1 shifting issue, but now the issue is that it still does the 2-1 kick down properly, but at 4800 rpm, it makes the up shift to 2nd gear as the rpm is coming up. I cannot get it to make the down shift and pull all the way through 6000 rpm, unless I mash the pedal below 40 mph. The 4l60e had the tune setup the same way and it never had this issue.

I tried to change the 1-2 up shift mph to closely match the RPM shift point and that resulted in it not up shifting period to 2nd gear at WOT. It bounces off the limiter.

I am lost on what to do. I would like it to kick down to 1st gear at or below 48mph, but cannot get it to cooperate. Everything else functions perfectly with this trans.

Ray Finkle

Any recommendations?

03sierraslt

iTrader: (22)

Post the tune and a scan.