Hey guys, new here. Just came across the forum/ thread after going through a very similar situation with the 6L90 trans in my 2010 Silverado 2500hd. However, in my case the transmission shuddered off and on for a week or two before I took it to the shop by which time there were tons of metal shavings in on the magnet. Ended up replacing the trans with a remanufactured unit from these guys, https://reman-transmission.com/transmission-codes/?code=6L90. They told me over the phone that they fix manufacturer defects in the rebuild and that their 6L90s don't have the same issue... I guess only time will tell.
