E38 PCM Running a 2007 4L60E

I attached the base tune to this post, that I just downloaded from the PCM.

Do I simply do a segment swap with a 2008 Silverado 5.3L? I can't really find anywhere in the tune where it says the transmission it is setup for. I'm used to the Gen 3 style tuning, so this gen 4 stuff is new to me.

It's running a 2007 4L60E 15 pin


Back story on the PCM.. I took over this project car (LS3 into 1970 Cutlass 442) from a shop that was taking too long. It came with a new harness that was pinned out to work w/ a 4L60E and the PCM has a "PSI Conversions" sticker on it -- which lead me to believe this PCM might already be setup to run the 4L60E. But after downloading the tune, the "ECM Trans Type" is set to "Manual". E38/T42

Attachment 90618

E38 is only an ECM, with no trans controller stuff inside it at all. It's not a PCM (which has both) like gen3 stuff.

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Originally Posted by blindsquirrel

E38 is only an ECM, with no trans controller stuff inside it at all. It's not a PCM (which has both) like gen3 stuff.

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Thanks for the reply!

So does it matter what OS the transmission controller has or the service number? I'm seeing differing opinions. Some people say the E38 has to have a "matching" T42, others say it doesn't.

My plan is to do a segment swap with a T42 tune from the repository that matches the OS on my current T42, but some are saying it wont work, and that the ECM has to match the TCM - but I don't see how you can match them, unless you pull both computers out of the same car.

Here's a '07 Silverado 4L60E file you can try using or pulling parts from.

I don't know about E38 service number compatibility between various OS combos, you need to talk to DSteck.

To see if a tune is set up for 60E or 80E when you don't have the operating system IDs memorized, open Trans > Shift General tab and look at the 1st Gear Ratio box. 3.06:1 is a 60E, 2.48:1 is a 80E.