I have a 2001 durango w/5.9 that I rebuilt the trans maybe 6 years ago. At the time I used Mighty brand multi vehicle fluid, and replaced the torque converter with a reman unit. The trans shifts fine but the lock-up has been getting funny and now has turned the light on. Just curious what the thoughts are about the possibility of playing with or changing the fluid. Or if the converter was just a p.o.s. from jump and the only remedy is a new one.
I was thinking about a quart of type f added to it.