I have a 96 12 valve. I blew up my overdrive on my built trans as well but didn't get stranded thankfully. Found the snap ring in pieces on the bottom of the pan. Doing too many high way pulls and 4WD launches lol
that turbo flutter is really bad for that brand new turbo. What's happening is its jerking the whole thing on its shaft back-and-forth. if that makes sense. The compressor shaft . Quickest way to wear out a turbo. Only way to avoid that is to go easy on throttle when you're about to hit overdrive. Try to keep it from doing that as much as you can. I'm not sure how to fix that to be honest, besides a blow off valve, which would be difficult to hook up and a little useless, because that shift is so quick. I had a blow off valve on my Cummins hooked up to vacuum on a switch so I could manually dump the air right before I shift to the next gear.