Ok I have a 99 SS base and have two codes coming up for it- P0700 and a p1738. Since the weather has gotten cold it seems a bit hesitant to upshift when it's cold, but once the engine and trans warm up, it shifts fine. The kicker is, it's a new (used JDM) trans, and I got the exact same two codes on my old trans which was also shifting fine... I imagine it's something electrical, but do any of you know what exactly? I had swap over the lock up solenoids from the old, as the new one (used JDM) the connectors were broken off, could that be the culprit? :shrug: Any input is much obliged..