J
Joisey Jim
Guest
My '94 SC (4R70W auto trans) sounds like I am driving over rumble strips when I go WOT, say over 50mph. I had the typical shift shudder years ago and changing over to Mercon V has eliminated that for over 100k now. This is different and doesn't occur when going WOT from a standing start; so I've eliminated balance, U-joint, trans or diff mount problems. It only occurs once it's moved into O/D and presumably the torque converter has locked up. I've totally flushed the fluid but the problem is still there. Could it be a bad relay or is the torque converter on it's last legs.