hey guys, I really need someones help with this. I am literally at a dead end with this. Just did a 454/4l80e swap to my 90 suburban and did a 7747(90 sub) to 7427(94 sub). 54/4l80e came out of my 94suburban that ran drove fine right before it was pulled. Everything is running smooth none other then the tranny. I get code 81 (2-3 shift solenoid failure). I look under current malfunction codes list in tunerpro and when the key is in the ignition position, both codes say OK. When i actually start and run the truck, thats when the code comes up and says error. I rechecked all my electrical and all is fine. When i ground out the pinouts at the ecm, I can hear the solenoids clicking. I even hooked the ignition feed(pink wire) to a relay to rule out that i wasn't getting enough volts. I ohmed out the solenoid through the pass thru connector and i get 20.5 ohms on both solenoids. This transmission was just rebuilt about 2-3k miles ago and i just put a transgo hd2 in the trans when it was out. I also replaced the internal harness and the external harness. Which i checked my connections about a gazillion times and all is fine. I even tried to go back to a $31 mask(bmhm) which was originally on the ecm(i switched to $OE). No change. Im pretty much at a dead end. I tried changing the solenoid, no luck. Im waiting for a new PCM to come, should be here tomorrow. Anybody have any other ideas on what it could be? I uploaded a transmission datalog from tunerpro if anyone could look at it real quick, thank you.

transmission datalog link: http://s000.tinyupload.com/index.php...85880531752938

 

I don't think I can help...but I hate to see a question un-answered.

1. The computer, the wire harness, and the engine/transmission are all from a '94? Are they all from the same donor vehicle?
2. Does the trans shift properly, but throws codes? Or does it not shift right?
3. I can't tell from the description--Did the trans shift properly AFTER the shift kit was installed, but before you put the trans into your '90 Suburban?