E40 computer OS swap?

[Turbhoe]

I'm doing a v8 swap with in a Colorado. I need to run an E40 computer to do it. I got a computer from the local junk yard but it's from a grandprix v6. Can I do a full write and put a trailblazer v8 OS on it? Also, is there a difference in the t42 TCM's? I also got it from a grandprix.
I've been searching for days with no real answer. Service number is 12581501

[ScarabEpic22]

E40 was never used with any V6s to my knowledge. Can you confirm it's a real E40 and says E40 on the ECM case? I searched for that service number and it came up with an 04 Grand Prix...the E40 was only used from 05-06 with 5.3/6.0L V8s as a stop gap between the 1MB LSB1 PCM and the E38/E67s.

If it's a real E40, you might be able to do a full write with a GM Tech II, but as this is a Gen IV ECM (E40) it will require SPS to program the ETC/DBW controller. No aftermarket tuning product can do this as it is a write-only controller.

[GMPX]

I'm guessing it is a P05....looks just like an E40. As Erik said, look at the bottom of the case, you'll see 'E40' or 'P05' stamped in the aluminium cover.

[04colyZQ8]

gonna be a P12, you will need a E40, to do this, you will need Tis or sps to flash it to a 06 SSR or 06 trailblazer. The interchange on Hollander has bee wrong for years now they ay the v6 computer works but it doesn't, the E40 has E40 cast into the case. Send me a PM for more help

[Turbhoe]

i wound up just using everything from an 03 Tahoe. It was much easier than going the e40 route. parts were way easier to find as well. but for my next trick i need to swap a 07 TBSS PCM into my 04 tahoe so i can get rid of the stupid ls3 converter box.

[04colyZQ8]

i wound up just using everything from an 03 Tahoe. It was much easier than going the e40 route. parts were way easier to find as well. but for my next trick i need to swap a 07 TBSS PCM into my 04 tahoe so i can get rid of the stupid ls3 converter box.

Your speedo in your Colorado must not work? With the 03 Tahoe? Just not wanting others to go the same route as you, and then find out stuff doesn't work.

Why do you have a ls3 convertor box? 58x motor with 24x crank module? To run stock 04 Tahoe pcm? But you'd rather run a pcm directly? If so you will need a e38 if no class 2 is required? And a e67 if class 2 is required? Either way you will need a t42 to run the auto trans!