LS swapped 69 Firebird 4l60e issues
TECH Junkie
Joined: Dec 2012
Posts: 3,615
Likes: 1,327
From: Iowa
And I have something cool coming to market regarding this
It will be in 3rd....with similar (or more) clutch capacity than a th400 direct clutch
Thread Starter
Teching In
Joined: Aug 2006
Posts: 25
Likes: 2
From: Chandler AZ
I wanted to circle back here and share the long sought after fix to my issue. I tore apart the 60E that I rebuilt multiple times and was dumbfounded that I couldn’t find the smoking gun. So I purchased a Performabuilt level 2 trans and installed it only to have the same damn issue. So I knew it was tune related and also that the trans I rebuilt myself was probably just fine. When I got the LS2 from the salvage yard car I was able to get the E40 ECU and the dbw pedal. I couldn’t find the TCM from the car so I bought another T42 TCM from another 2005 corvette on eBay. Where I goofed was thinking that it would tie right into my setup (HP tuners read it and I was able to tune it), however I didn’t reprogram the TCM with a tech 2 and pair it to the ECU. I purchased a VCX Nano off Amazon and paid the $40 through ACdelco TDS for SPS programming and I found only 1 of the 4 links to the ECU was working and the others said uncalibrated. I did a replace and reprogram for the TCM and now my car drives and shifts perfectly! So I hope this solution helps anyone in the future who runs into the same or similar issue, and the importance of pairing the ECU and TCM.
