last night my od light started flashing around 50mph . I shut it off to reset it and it stayed off the rest of the drive home about 30min at about 50mph was good all morning . now its at it again. some background it was a used trans I installed looked to have a newer converter( blue in color) It had some shifting issues so I put a solenoid pack in it from what it seemed like reparable vender and I also installed a transgo shift kit in the valve body. it seemed to help everything in general. that was roughly 8 months ago drive it almost daily never any codes ever for that matter with this trans. so I guess what I'm asking where do I start? do I check pressures? what should I be looking at? did the converter fail or is it in the valve body or just weak pressures? I'm not pulling out bad converter or solenoid pack as I don't have faith in any part newer or not. I do have a hunch that the pump is tired on this trans it does make some noise at wot or harder acceleration. I plan on selling this truck like I was gonna put a for sale sign in it at the end of the month anyway, but I don't want to give it away if I can fix it as I feel it is still a reliable form of transportation. anybody any thought to narrow it down I don't wanna throw parts at it I have pressure gauges and have the means of the pulling the trans and a older brick snap on scanner. any input is welcome