So, new-to-me 2005 silverado (Quadrasteer) has been a problem child. 2005 1500 5.3 4x4 4L60E 189k Initial test drive indicated no issues but recently there has started to be a fairly big flare in the 2-3 shift and on the highway in 4th any application of throttle had a big flare (500 rpm) before the rpms would drop back down. Quick did a filter drop and half fluid replacement to see if it may help, still a flare and almost worse 4th gear behavior. Old fluid was dark with barely a semblance of red. Pan was dirty but not excessively so. No burnt smell. I know a rebuild is highly likely but I'm interested to hear your wager on if this can be covered up for a while with a max life full change, corvette servo, boost valve, and a reset on the adaptives.