Note: I am typing this for my husband, so please forgive me if I mess up any of the terminology. Building cars is his dream and this is his first build. He is quite discouraged at this point, but he is a brilliant mechanic and I know he can do this! He is also stubborn and rarely asks for help. I am just getting the thread started for him. We have scoured the forum for ideas and have tried what we've found. I am hoping some of the more experienced folks here might have some new leads to follow. He will be the one managing replies. Thanks in advance, Danielle
I am doing an LS swap on a '94 Camaro. I am using an LM7 out of a 2000 Chevy Silverado 4x4 and a 4L60e transmission. I am using the PCM from the donor truck and have used the much of the original wiring harnesses for the engine and trans. The engine runs great (twin turbos and all), but the dang thing won't drive forward. I have ruled out any mechanical problems, going as far as buying a whole new transmission. It really seems to be an issue with the tune, but I'm new to tuning, so I'm not sure what.
After installing the transmission (both times), the car will go in reverse. Nothing in D or shifting through gears manually. Nothing when you unplug the trans to force it into limp mode. Last night, I did a segment swap for the trans. After that, still no forward drive. However, the wheels rotated slowly backward when put in low. (Odd.) I thought maybe the problem had to do with tuning being different for a 2wd vs. 4wd transmission. I couldn't find a 2wd vehicle with 4L60e with the same OS so I could do another segment swap. I carefully compared a tune for a 2wd Silverado and changed the setting on my tune to match. After writing the new tune to the car, reverse still works, but we're back to nothing in Drive or manually shifting through the gears. However, we now when the trans is unplugged it can be manually shifted into 2 & 3.
Any ideas about what could be going on? (Other than a mechanical problem with the transmission.) I am running out of ideas of things to check. Is there something wrong with the tune still? Could it be an issue with wiring? I am attaching the tune I am currently using in case it helps to look at it.
-Tony