If you’re looking at upgrading your 7747 to the faster 7427. Here’s your chance.
i have a 7427, already has the G2 chip adapter and 512 eprom in it. Also has new connector backshells to replace...

Thanks Dave W.
I have thought about the 4L60E, but my 700R4 was recently rebuilt, so figured I would just use it for now

Does anyone have a good bin file for a 7427 ECM with a 700r4? The one in the sticky doesn’t work. Or can i use the fast 355 adx with a standard bin and save the bin off of that? I getting ready...

Thanks. I had read through your thread. Mostly the tune is good. Van runs great. Just not totally happy with warm idle. I had read somewhere there’s a fine line when it comes to bpw and idle. So...

Thanks. So is C7 on the 7747 not used? The high gear/temp switch?

Ok, I have decided to switch from the 7747 to the 7427. Setup is a 5.7TBI with a 700R4.
Couple questions.. I have tried to filter through the conversion threads, but trying to pick out 700R4...

Ok. I’m in the process of tuning my 85 G20. Early Crate 350 with 7747 ECM. most of the fuel map and timing is good but warm idle has a slight miss. Ive read bpw can do this. Mine is in the 140ish...

Helo, new here. Used to play with tuning LS's when they came out. Haven't done much since. Now trying to tune a TBI motor. Plus will have to get back to tuning the LS1 when I get the motor back...