This is what I did. I cut just a little more off mine.
Easy shift into reverse (with one hand..lol) and it stays in the 5/6 gate when shifting to 5th.
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I used to swap in a soft spring that I purchased of ebay. I did this for several builds years ago. I never liked it, and one time on a WOT 4-5 shift... i hit the reverse gate. It never actually went in (grinded). It damaged the trans though. So I asked my harness builder if we could make the factory solenoid activate. He says yes of course. Been using the ecm ever since. I don't use the E67 because I just don't care for it. The E38 is my preference. I would get an E38 w an 06 or 07 LS2 manual (6 speed)corvette file in it. I know that will solve your issue. I have run into weird glitches not starting off with the file that closely matches the engine/trans. Lots of ways to make things work in these swaps. But this has worked best for me.
The E67 isn’t actually a LS3/LS7 ECU. A factory ECU for these engines was mainly the the E38. Most of the new trucks, Hummers, LS9 and some LS3s saw the E67.
Based on my limited tuning knowledge, the car being and auto or manual is not part of the tune. When you move a tune from one ECU to another, your just changing running parameters.
Its important to know what ECU the OP is running. It may not be wired correctly. The signal from the computer is a ground, you would need to run a 12v power source to make it work.
auto & manual is def a part of the file. At least in the factory tunes. U can change it in HP tuners or efi live, etc, but that doesn't actually change the file like in the old 411 ecm.. For example, The LS2 MAP sens is different from LS3. If you try to run an automatic file w a manual trans, you need to wire in a TCM to get the correct speedo voltage. Otherwise the ecm reads 12 volts,and sees 158mph all the time. I bought a PSi computer for an LS2/T56 build a few years ago. I asked for an LS2 manual file from an 07 corvette. I had several issues, and upon pulling the file it was for an 08 corvette. 6 months and many hours on the phone, It never got fixed. The told me they don't have any LS2 files. He assured me they changed everything needed in the tune for an LS2. Finally I bought a blank ecm and had the LS2 file loaded on it. Every single problem was fixed. This has happened to others and in another build of mine. There are so many variables, and some have ways of getting around it. I'm just trying to help simplify. Oh, and the newer ecms don't like to be overwritten with a different file lol. Have a couple that we bricked experimenting :)
I added the pin on my GMPP harness and then figured out how to “trick” The GMPP pcm to work with my magnum. The GMPP is a little different then the other GM pcms. The trans reluctor setting of 40 is locked in (because they assume you are going to use an electronic auto trans or a Super magnum (all are 40 tooth trans signals). If you are using a regular magnum, they are 12 tooth and an LS style t56 is a 17 tooth reluctor wheel on trans). If you use one of the non 40 tooth trans, it is super easy to reconfigure the programming with HP tuners. This is only the case with a GMPP PCM.