Originally Posted By: Corvette Owner
Mobil 1 ATF is NOT compatible with 1997-2000 Corvette MN6 (T56) transmissions because they used paper blocker rings. They changed that in 2001. After extended use it will cause grinding going into gears (my switching to Amsoil ATD stopped this immediately).
I use Amsoil ATD (although you can also use Amsoil ATF) in my 1998 Corvette MN6 and it is great.
Why would the Amsoil be OK, but the M1 not for the cellulose blocker rings?? (I've heard that the Red Line D4 could cause problems, due to high POE basestock content. This is why I am hesitant to try it in mine, even though MANY swear by it in this gearbox {like Sam Strano}, even the early ones with the "paper" blocker rings.)
Also, what is ATD???