Forgive me if this is posted int the wrong section. Admin’s please move it if necessary.

I want to share how easy it is to burn up your transmission with a simple PCM swap. I did not burn mine up because I caught what is happening quickly.
I will keep the back story brief and get to the reason you can burn up your transmission in less than 500 miles.
I'm doing an LS swap to my 2000 S10 2.2L with a 2004 Trailblazer/SSR LM4 motor & 2002 CHD transmission. I started with a tune file that kept the battery light on. Through a lot of research, I ended up with the conclusion that the OS (operating system) of the PCM was the issue and needed to be changed. I bought a PCM from Flashmasters for a 2004 SSR because that is basically what matched my set up best. Dual fans, O2's, alternator & serial data for the instrument cluster all best matched the SSR OS.

I swapped all the tune changes from the old PCM that was working other than the battery light.

So here is what I noticed right off the bat. I had no TCC at all & all the shifts are soft. I have been babying the truck all along because I must get the tune right first before I start hammering it.

I hooked up my HPtuners interface and opened the scanner. I have a transmission layout set up. It had little to no load % change. I was able to apply the TCC & adjust my EPC Milliamp settings to confirm that the shifts got crisp. I found no misfire data.

I took a log file (3-28-24 gas to home) of the data from the PCM while I played with the EPC amp. You can see the .49amp desired and actual setting get commanded around the 2:15-2:20 mark. The transmission shifts much better until I turn that off later. You can see the load % against Throttle % is very low even at 25% throttle you only see 20% load.

I confirmed that there are no codes in the new PCM.



So to confirm that I’m not going down the wrong rabbit hole here, I installed the old PCM and took test drive and a log file (2005 Silverado PCM) of that. I have load % that goes to above 80% as it should. You can also see the TCC enable go to locked as it actually locks the converter.

Now why I posted this here instead of the PCM & tuning section is…

1) This is how easy it is to burn up a 4L60E on a road test if your not paying attention.

2) Where does a novice tuning guy start to fix this???

a. I can command TCC with HPtuners

b. I can command pressure rise with HPtuners

 

1) This is how easy it is to burn up a 4L60E on a road test if your not paying attention.

pretty easy if you're not logging line pressure

2) Where does a novice tuning guy start to fix this???

log line pressure

a. I can command TCC with HPtuners

yes

b. I can command pressure rise with HPtuners

yes, but only a small range of pressure gets EPC/boost oil. if theres a problem elsewhere....no amount of fingerbanging the keyboard will fix it



please note it is early, i need more coffee and I have the flu...so please forgive my curtness

 

No problem with the "curtness". You just read my post to reply not to understand.
As stated and you can verify by the log file posted that it can make pressure, show a load more than 80%, and apply TCC with the first PCM. If I install the new PCM I have the issue, put he old back its good again.
I don't need a pressure gauge to feel a commanded change to line pressure. It's soft at .98amp much better at .49amp and very harsh at .20amp. it won't go past 25% load and the PCM uses load to raise line..
The transmission made 220psi on my original pressure test after firing it up on first start and testing after the swap.