hi,if you didn't have a problem with the gearbox before you changed the atf,then I would suggest you have a lock somewhere in the atf cooler/pipes or a fill error.did you change the filter in the sump pan.dextron111 is a good atf for your gearbox .when you fill with atf to dipstick line,select all gears a few times then check level.repeat this process several times before you test drive.you may need to flush the system to clear all pathways and lines.
tranny granny
December 2011