Same results here with Valair shuddering. Surgically clean on install, very careful not to "tweek" the center hub with trans misalignment during install, broke in as instructed. Shuddered. Found an unintentional fix for it though. Blew the back cover off the HPOP one day, dumped a couple gallons of 15W40 into the valley which of course exited through the valley drain out the bellhousing. Not much shuddering now, just slipping at high boost in 4th gear! Must have got oil on the disc. So I guess it will get swapped again. Back to Southbend if I do.